Lenovo W520
Configured with the 1080P display, and the Quadro 2000m, you are looking at an extremely well built machine that will last. The 2000m is roughly equivalent to the Geforce 555m, and will play any game on the market.
I currently own one of these myself, though I only got the 1000m video card. Even with this card, I have yet to find a game it would not tackle. No, I don't run Skyrim, or WoW on max quality @1080P, but most games are damned close. I can play Fallout 3/nv on max quality @ 1080P.
Maya 3d also seems to run extremely well. Though I have yet to bench it against anything else for comparisons sake.
Here is my advice to you: First, try to get your hands on the machines you are considering. Asus makes some very compelling machines, yet every one I have touched, has always felt cheap. I cannot vouch for lifespan on those machines, as I cannot stand to use them. That said, others may disagree. This is where your personal opinion comes into play. Grab the machine, flex them, type on them, test every thing out. The keyboards, speakers, touchpad, etc. Understand that some companies have earned a well deserved reputation. HP for example, made the most ridiculous move ever after buying Compaq. Their business level support went from unlimited free tech support as long as you own your product to we don't give a damn, your year is up.
Second: Figure out what specs REALLY matter to you. 3dsmax will run well on just about any of the machines below. But you have gaming machines listed, with one workstation among them. Which is more important? The Quadro 1000M and 2000M in the Lenovo above, are running drivers CERTIFIED for 3dsmax. The video card is designed specifically for that usage. If your primary workload is going to be 3dsmax, then find a machine running a pro-grade video card. Namely because of the drivers, and firmware testing. If GAMING is your primary goal, then go with something that has a powerful consumer class card. Also, do you want a quad core, or a higher clocked dual core machine? Again, this depends on your work load. My Lenovo runs a 2.7Ghz dual core for a reason - because it was very cost prohibitive to get into a 2.7Ghz quad core. On average, the turbo boost actually keeps this sucker at 3.2Ghz playing games. Those quads will limit themselves to 2.8~3.0. HOWEVER if you are running 3dsmax as your primary application, then the quad MAY be a better option as it is very well threaded.
Third: You are asking for a 5 year life, in an industry with a 4 year (typical) max usefulness. There is no way to truly prepare for the differences in computing 5 years from now. 5 years from now may actually see massively multicore processors, 32GB of ram or more, or even the realization of APU's actually replacing the CPU (for real workloads, not the kiddie stuff they keep pushing). If this is really a concern, your best bet may be to buy a 'good enough' machine now, and set asside money for another 3 to 4 years from now.
Ok, all of that out of the way, here is what I know about the machines listed below.
First the Alienware, that machine is a beast. It is fast, and powerful. You have an extremely wide range of processors and video cards available. That said, upgrades are EXPENSIVE. I mean prohibitively expensive. A 4GB ram upgrade being about 5x the cost of newegg. They also have very disappointing displays. Color gamut being fairly low, and having ok viewing angles. The cases are straight up metal. These machines are TANKS. Understanding that also makes them quite heavy. If you need something that can take abuse, this is it. Sound quality is excellent on these machines as well. They are also the only machines that allow for optional X-Fi audio - if that matters to you.
The HP I cannot comment specifically on that model, but I can comment on similar machines (they have a lot of them where I work). These machines are fairly well built, somewhat plasticity though. The keyboards are definitely a cut above the norm, and have taken a few key points from Lenovo (eraser head mouse anyone?). The displays can be anywhere from amazing, to ok depending on which display you get. I don't believe HP offers the IPS displays anymore, but it may be worth asking. That model lists the FireGl 5950 as the base video card, or the Nvidia Quadro 3000 (and higher). I highly recommend going with an Nvidia card in this case. Namely because they seem better supported in 3d workstation applications. That machine allows up to an Nvidia Quadro 5010 - which is a damned powerful card - however, don't get that card. The bright side here is that the cooling system CAN handle it, but if you want a machine that runs COOL, then grab the next model lower, or even one further down. If you don't want a fan blasting 80 degree Celsius air into your lap, this is advice worth taking.
Asus makes powerful gaming machines for those on a budget. That budget ideal comes with its own price though. The keyboards are well below par, displays are mediocre on a good day, and the chassis never feel solid. That said, they are designed to keep a cool running machine no matter the abuse. If you want to save money, while grabbing a powerful machine, then Asus is the place to be.
The Origon Eon 17 is running a desktop processor. This means two very important things. ONE: It is going to run HOT. 130Watt TDP is hard to deal with in a PC, let alone a notebook. Then add in 2 video cards, and you have a cooling nightmare. TWO: The battery life is going to be SHORT. This machines desktop CPU is also a gulftown Intel processor. Meaning a 1st generation core i series chip. Any of the Sandy Bridge machines will run just as well in most situations, and will net you better battery life.
Lastly, I have two machines not on your list: The Lenovo I mentioned above first then an interesting candidate to consider.
The W520 is a 15" notebook with an amazing 1080P display - running 95% color Gamut. The video card choices aren't quite as powerful as what you have listed, but the 2000M can still easily handle all current games. This machine also has one of the best keyboards you are ever likely to use. Easily besting even my desktop keyboards. I also get about 5-6 hours consistently on the battery, though I have managed 8 on occasion. There aren't any real major drawbacks, but it isn't perfect either. The touchpad is one of those textured pieces of crap that feels like it will take several layers of skin off. While this machine has a metal rollcage - something Lenovo is famous for - it does not have a metal shell. The lid and very bottom I believe metal, but the deck, and most touchable surface areas are plastic. Speakers are very tiny, and hard to hear. Also, certain power management choices caused problems. Namely that the machine would shut off power to the DVD drive, and would not turn it back on, forcing me to remove the drive and reinsert it (takes about 10 seconds total). I simply disabled that feature though. The other nice thing, is that this machine weighs about 6 lbs. About 1/2 the weight of the machines you listed. Again, not sure if that is important to you or not...
One last machine worth investigating. I have no real good information on these machines, as they are VERY new to the market.
The Razer Blade: This is Razers first laptop, and you can tell quite easily what the goal was - make a truly portable gaming machine. This machine is rocking a 17" display, and keeping the weight down to about 7lbs. It runs a fast dual core i7, and nvidia 555m. It has an all aluminum construction similar to the Apple MBP, and a very different keyboard/mouse layout. Again, not too much can be said for expected lifespan, speakers, etc - as these things are just that new. But they have a great company backing those machines.
Sorry I ended up with a novel... but I think it is important to ensure that you get what is really needed. No one wants to waste $2,000 or more on a machine to find they wasted it. Which reminds me, talk to the companies directly, and see what they can do for you! You would be surprised what they would be willing to do. I have an agent with Lenovo that managed to cut the price of my machine by about $300.