Yeah I already was there. But I cant find any of those cards. I was looking for the amd 5850 but all i can find is Sapphire.
AMD produces the chips and reference designs, and companies like Sapphire, XFX and others make the actual cards you can buy.
But if you're thinking of buying a GPU strictly for mining purposes you better work out the math first. It may take you a long time to get your money back. Also keep in mind that the difficulty is likely to increase quite a bit now that ASICs are getting deployed.
What are the differences between XFX and sapphire cards?