I was wondering what a 7900GTX would sell for? My friend gave me his when he upgraded to his 8800GT. I really wanted to upgrade to the 8800GT myself, but since I just got the 7900GTX from the 7600GT it is already a hugh jump. If I could get a decent amount of cash for the 7900GTX I might just sell that and order an 8800GT.
Check what they're bringing on ebay to get a good idea.