Yes, you can run two monitors of different size and aspect ratio and run them at different resolutions (either if you want...i.e. same size and aspect ratio, but you just want to run one at a higher resolution or if you have to...i.e. one is a different aspect ratio or size). This assumes your grapihcs card can support such an effort, which will usually be true. On my new computer, I am running one widescreen 20" monitor and one 19" more traditional aspect ratio monitor (both LCDs). I deliberately wanted the more traditional aspect ratio as it can be rotated for either portrait or landscape mode (OK, so just about any monitor can actually be rotated, but this one does so on its stand...not having to "fudge" the rotation).

As to your CRT, most likely most would not be interested...mainly due to the size (17" is kind of small these days...amazing how what we deem acceptable changes...used to be 13" CRTs where standard and a 17" was HUGE)...BUT there might be someone who games who might want it...generally speaking, while CRTs are heavier and more of a pain in the butt to have sitting a desk, some gamers like them better as most LCD's still have ghosting when playing very fast motion games.

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[soapbox] Backup good...no backup bad!! [/soap box]