Currently I'm running one XFX HD 5770 GPU. It works good for what I use it for at the moment but in anticipation for the release of a few new graphic intensive games I plan on playing I was thinking of upgrading. My question is should I get another 5770 and run two in crossfire or just pick up something like a 6850 and run a single with the option of upgrading to two in the future. Thanks
Dual HD 5770s destroys a single HD 6850. The 6850 is approximately the same as a 5770. So, Crossfire 5770s will outperform a single 6850. In the future, you may want to skip the 6000 series and get an HD 7000 series card or an NVidia 600 series.