Hyper 212+ evo in a push/pull configuration would be excellent and the best choice out of the 4. The Corsair cooler offers similar performance as the cooler master but at a heftier price tag. So I'd definitely go with the 212 evo in push/pull. With your build you may even want to consider dropping the PSU down to a corsair tx750m. You'll still have the option of doing crossfire with that psu. This way you may be able to save some cash and put it towards a better gpu...something like the 6950 perhaps?