if you want a gaming pc, mostly focus on buying better processor and gfx card, don't waste money on RAM, you can always upgrade it later
This is close to what im going to buy:
VGA PALIT GeForce 9800GT Super PCI-E, 1024 MB, 256bit DDR3, SLI Ready, CRT, DVI, HDMI
CPU AMD Phenom Quad-Core 9750, socket 940(AM2)
MB MSI KA780GM, 780G+SB700,4DDRII,1PCI-Ex16,1PCI-Ex1,2PCI,5SATA2,GbLAN,RAID,DVI+HDMI,uATX,1394
RAM A-DATA 2GB DDR3 1333MHz