What upgrades would I need to get a better gaming computer?

A good gaming pc. Well you want duel core cpu, 4 gigs ram. top of the line video card with as much video memory as you can get. G force vid cards aint to bad but with all the new games coming out it be better to have the top of the line. Id say like a 2.8ghz duel core cpu. Good 3d support on you video card. Basically a fast cpu fast v card and as much mem for ram and video card. I have a 3.0 ghz duel core cpu 4 gigd ram and a brand new top of the line v card.