I Would go with:
most people like AMD's, but an intel with hyper-threading will do pretty much fine. (thats an opinion, not a fact)
Get any lga-775 mobo compatible with 240-pin ddr2 and with a PCI-E slot. (preferably asus)
And any of the 7*** series cards from Nvidia will do just fine, the more expensive=longer time till next upgrade.
And for the case, make sure it looks cool, and has extremely good cooling. check the reviews for that.
for the mobo, case, adn CPU, it is all up to how much you want to spend.
O, and for the HD, get a big maxtor with good reviews.
And this dvd drive: http://www.newegg.com/Product/Produc...82E16827101131
And any cdrw drive. happy gaming. you might want to go a different route though seeya.