I'm somewhat new to the computer hardware world, but I'd say check out newegg first. Also if you are looking to spend around $300-$400, check out the GeForce 7900 GT. They run around that price range on newegg and are also cheaper and better than the 7800 GTX series.
Go ahead and check these out. I'll post 7900 GT, 7800 GTX, and 7800 GT when available to compare.
BFG 7900 GT
http://www.newegg.com/Product/Produc...82E16814143048
BFG 7800 GTX
http://www.newegg.com/Product/Produc...82E16814143036
EVGA 7900 GT
http://www.newegg.com/Product/Produc...82E16814130281
XFX 7900 GT
http://www.newegg.com/Product/Produc...82E16814150149
XFX 7800 GT
http://www.newegg.com/Product/Produc...82E16814150108
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