Since cost is no option, how about:
AMD X2 4800+ (or X2 3800+ and Overclock it, or Opty 170 and overclock it) or FX if you really want to spend alot
Video: either 7900GTX or X1900XTX (Nvidia or ATi, take your pick, look at benchmarks on whatever games you like)
MB: Asus A8n32, (nforce4), Epox 9npa (I think that is right name, non-SLI nforce4) or maybe one of the ATI crossfire boards just coming out. Or DFI expert
HD 150Gig Raptor, please don't use RAID 0, it's dangerous and doesn't help for day to day use. Don't get the 74Gig raptor, it is an oder model and isn't as fast. Throw in a 400-500Gig WD or Hitachi for storage if needed for a 2nd drive
Cooling: Scythe Ninja
Case: Very subjective. I like the Antec P180 mid tower (quiet, but a bit cramped). Or a full tower lian-li
RAM: 2Gig of OCZ (or mushkin or G.skill) DDR500 3-3-2. IF you don't want to worry about 1-3% gains, just get any good 2-3-2 DDR400 RAM, and use a divider to keep the RAM around DDR400.
PS: Seasonic 600W, it's quiet. OCZ is good as well. PCP&C is great, but expensive and louder
I wouldn't trust newegg reviews, they are screened by newegg (read the fine print), so it isn't a true representation of the reviews, as well as a lot of them of written by clueless people I think.
Do you have a monitor already? That will help determine video card options. (Bigger minotr = more pixels = need more powerful video card)