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It is not a silly question.
Core 2 duo is great for a budget or the quad cores by Intel are best if you want to shell out money for little improvement in game performance (has advantages games do not know how to take advantage of the quad core yet)
AMD is great but the new cores by intel blow AMD away in benchmark and performance tests in most areas.
Vista or XP is fine, XP is just more compatible however does not offer DX 10.
Vista reaches it peak performance with 4GB of memory or more
XP does not know how to take advantage of memory above 2GB
DDR 3 is out so if your not on a budget that would be good
ATI graphics cards are good but Nvidia is better(Yes I have ATI)
NVIDIA cards that support DX 10 would be a nice choice, to save on money if you upgrade in a year.
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