If gaming is the goal, get XP SP3.
I have some money to blow and want to know what the bottleneck in my computer is. i have windows vista 32bit home premium. Nvidia Geforce 8800GT graphics card. (not sure of sound card.) Super Multi DVD+RW DL w/Labelflash 4 Gigs of DDR2 Dual-Channel Ram, AMD Phenom 9600 quad processor, 500 gig hard disk. I myself cannot see an obvious choice so I was woundering if any of you had an opinion.