I have a  amd radeon hd 6859 windforce about 1 year old no problems with it how much would it sell for aproxamitly. Would it even sell. Thanks

Hmmmmm... I dunno... But I mean, you can pick up a brand new 7790 for 140... Soooooo, if it doesn't perform as good as that, go from there? 7770 - $90-100