It will scale down to any resolution you throw at it. You can choose to display the pixels 1:1 (i.e. 1024x768 is a small box in the middle of the screen), Aspect (the image is blown up as far as it'll go while still maintaining its original aspect ratio), or Fill, which of course fills the entire screen (which sometimes looks a little off with 4:3 resolutions).
Future games...that is a real concern. I have a 6800GT at Ultra speeds myself, and I've had it since last July. I'm likely going to be upgrading to a next-generation card this summer, assuming they're out by then (and not $900+ :roll: ). Plus I'm overdue for an Athlon 64 to replace my XP anyway. But if you absolutely must run games at native resolution (I basically need to...scaling isn't bad, but native resolution is a lot better), then you might consider going with the 2005FPW (or 2001FP I suppose, if you don't want the 16:10 aspect ratio). But they're all pretty high resolution though, so there might not be too much of a difference - I can't say for sure because I have no first-hand experience with a 1920x1200 monitor. If you are really going to keep the video card for a few years (which is admittedly the more financially responsible thing to do

), either you'll have to play at lower resolutions, or get the smaller monitor.
I'm still a bit unclear on the resolution thing you're talking about - I used a 22" CRT for a while so I know what you're talking about (as it applies to Windows desktops) - but when rendering a game, if I'm not mistaken, the same scene is rendered either way, regardless of whether your resolution is 1024x768 or 1600x1200 (assuming your FOV is constant, which it should be). The higher resolution one is just rendered with more detail - if both are displayed on the same screen size (which you can do on any of these LCD monitors if you so choose), then the objects will be the same size in a game.