is the hd6870 are more good then hd5870 or hd 5850?
i dont think new product from ati more good then the previous one
better go for the old one that are more stable i think...

but i think ati version kick ass then nvidia
i read many article on rebrand of nvidia
such as rebrand of 9500gt from 8500gt that use the same technology with just some little adding to the new card
unlike that,ati always come with new technology in their new card such as from ddr3 to ddr5 and mostly support directx11