Ok, first of all, I strongly suggest you go with an AMD processor. You get more bang for your buck. Although at least you have a choice now with Intel as far as DDR RAM or Rambus, never ever go for rambus. Too much money for not nearly the performance promised.
Go AMD Processor,
ASUS or ABIT motherboards are darn good, espescially if you want to overclock, but they're good regardless. If you have no interest in overclocking Tyan also makes a hell of a good board.
Use DDR Ram, as I mentioned, don't bother with Rambus (RDRAM)
As far as video, forget ATI, get a Geforce, either a 3 or 4. You will pay less for a 3 but have to upgrade a year sooner with the 4. You make the call. Either one is good. Personally I would go for a 4 but that is up to you. ATI makes decent cards but games are designed for chipsets like the Geforce, and ATI does it's best to compete, that's why I say stay with the Geforce. It's the Voodoo of a couple of years ago.
Any more questions? Just let me know, I'm more than happy to answer.
Mike