Graphics card.

Which would be better to run games like Oblivion?

EVGA 256-P2-N636-AR GeForce 7950GT 256MB GDDR3 PCI Express x16 HDCP Video Card - Retail

eVGA 256-A8-N506-AX Geforce 7800GS 256MB GDDR3 AGP 4X/8X Video Card - Retail

 EVGA 256-P2-N527-RX GeForce 7800GTX 256MB GDDR3 PCI Express x16 Video Card

 EVGA 256-P2-N624-AR GeForce 7900GS 256MB GDDR3 PCI Express x16 KO Video Card - Retail

Just tell me which is best to run games like oblivion on max. Thanks guys!

just wait till you have enough for the 8800gts 320mb because the specs or your computer which you posted earlier are really good and would run this card great

no! dont get the 8600GT, the cards u listed are better then it. its just DX10SiKh22

Spot on! Either get the 7950Gt or the 8800GTS 320mb, the later is the best high performing DX10 option with the greatest performance/price ratio. However it will set you back about $100, so if money is tight, or you're just not ready to take the plunge into DX10, then get the 7950GT