I recomend the X800 GTO. I got the one from Saphire, which comes with a copper cooler. Not only is it very fast, but it's very cool paired with my P4 2.4c, so I still have a silent system. It runs much, much quieter than my Dad's X800 XT. :-)
The GTO is a hybrid card, so to speak. They're all a bit different, but in the same performance bracket. You might get a really good one and be able to overclock it like crazy.
I was under the impression that the nVidia cards still have some visual quality issues with pixel shaders. This ATI card is the best looking thing I've ever seen, especially with older games.
