sorry i gues i should add...
the computer uses as far as I can tell;
AMD phenom 9550 quad core running at 2.20 GHz
6 GIG RAM
Vista 64Bit. (awful, waiting on 7, but it wont download for one reason or another...)
ATI Radeon HD 3200 (as per driver, on device manager)
my display is a single VX2245wm running at 1680x1050 32bit colour and 59Hz refresh. It is something I will not be changing anytime soon.
Hybrid crossfire is a failure, you can get better performance with another card for less money.
That CPU will hold you back a good bit so I wouldn't consider anything over a 4850 without an upgrade.
As for Vista, look up ways to customize it because with a little time and patience I am fully confident that you can get it to the point where you can enjoy it, if not prefer it over XP. I have done that with many people.