Nvidia will soon announce a GTX660 and perhaps a GTX650 which will compete in the same price bracket as the 7850.
You might want to wait a week to check them out.
It seems that retailers are clearing out 7850 cards; I think they know something.
FX-4170 is about the only amd chip that can compete with Intel.
If your games can use 4 cores(not many do) then that might be a good choice.
Read this article for the best gaming cpu's at several price points.