Here is a better video card for the same price after rebate
Newegg.com - BFG Tech BFGR7950256GTOCE GeForce 7950GT 256MB 256-bit GDDR3 PCI Express x16 OC HDCP Video Card - Retail If you have 7600GT, then don't upgrade to 8600GT because you will not see any big difference.
I would get at least 8800GTS 320MB if you want to see a huge difference