Well, I did buy cutting edge,
P4 2.53 (533 FSB), 512 MB Rambus Ram, TI4600, etc...
Games ran like shit, utter shit (well, not super bad, but 60-80 fps). Unreal 2 was my main benchmark (with some space sims).
Then I installed windows 2000 instead of XP. My fps on most games doubled, and I have NO problems running Unreal 2 at 1200x1024x32 with maxed detail, lighting, anti-aliasing, 3D sound, etc.....
XP just doesn\'t handle things as well as 2k does, so my suggestion is to go back a generation.