Re: Why buy a 470???
If you don't want to spend the money on a 470 wait for the 460. Should still offer a lot more performance than your 8800gtx. IMO the 260 isn't going to be THAT much faster than your 8800GTX, and it would be dumb to buy an outdated card.
If your board can take a q9550 you would probably see a nice performance increase as well.