When I [sic] came out, I had an 8800 GTS
Just a quick point about Crysis - an 8800GTS would easily run that game in a playable fashion. I have a really old 6600GT and I've played all the way through Crysis probably three times now. Of course I have to run at 800x600 with most of the settings turned down to low, but with an 8800GTS you could easily maintain medium to high settings and have an acceptable frame rate. Plus the game is just so good that I'm willing to put up with a tiny bit of jerkiness here or there.
Seriously if you like FPS games, which I take it you do because you bought Doom 3 (something I just couldn't bring myself to do after playing the demo), do yourself a favour and pick up Crysis. Easily one of the best FPS games released in recent memory.