Well sounds nice, but 4Gigs???

and what board is all this going on? In what case, and under what PSU? Think about that?
Seriously dude... do some resurch.
want a good pc?
AMD Athlon 64x2 4000+
DFI LanParty SLi MOBO
Corsair XMS 2G or OCZ Gold 2G
BFG Tech or EVGA or ASUS nVidia 7800GT 256MB x2 in SLi
300GB WD Caviar SATA Drive
Creative Sound Blaster Audology Gamer 2 ZX 7.1 sound
Thermatake Tsunami, or Lian Li PC70 case
Hiper Type R 580Watt PSI
Lite On DVD+/-RW
Windows XP Home
Now by todays standirds and price thats a $2600 top of the line system, but by july with Vista and the new core from intel comeing out + hopes of a new socket from AMD, and of course new graphics comeing out every two or three months, thatll be a mainstream gameing rig with a price around $1500. Now that price looks pretty, but your not going to have top of the line like you want.
But before you venture further read up on your parts, and dont go for the biggest core clocks, and biggest titles. Go with what works.
Sorry to yell and nag.....
Cheers
Cameron