what is the best AMD processor?
For gaming, the best amd cpu is probably a phenom X4 975 BE chip @$150. It is similar in performance to the cheaper i3-2120:http://www.tomshardware.com/reviews/best-gaming-cpu-core-i3-2100-phenom-ii-x6-1075t,2859-8.html
It turns out that bulldozer was a disappointment for gamers.
On tom's latest article, on the best gaming cpu's for the money, there are NO winners at any price point for AMD.http://www.tomshardware.com/reviews/gaming-cpu-review-overclock,3106.html
If you have multi threaded apps that can use 8 cores, and that is your main interest, then bulldozer is more competitive.