Originally Posted by Roadhog
True, 6850 is another great option. I was just going for the fastest I could fit in his budget.
Oh I just realized that is what you linked. Good choice either way. Reason I give the 6850 the edge though is because their performance with each other is roughly identical, the 6870 only *slightly* winning. That, and the 6850 requires much less power, so it would be less of a burden on the PSU.
Plus if you're like me, you like your PC producing the least heat possible (keep in mind the difference between that, and keeping your PC cool - two separate things) and it wins in that department as well.