OCZ Vanquisher better for AMD builds.
I suggest OCZ Vendetta 2, you can get one for about 2.5k, great cooler. An alternative to that is TRUE(Thermalright Ultra 120)
Go for core contact freezer 90mm or thermalright ultima 90 if you want something a bit cheaper, though i strongly recommend the OCZ Vendetta 2.
You should be able to push to 4Ghz with it .