I dont understand why everyone ALWAYS recommends the Hyper212+ for all situations. I'd personally go with the Thermalright MUX-120, since you have $50 to put down on a good cooler. It's just better. Period. If you go to the results on the tests I linked, you'll see that it's the quietest thing they tested, and flat out is a better unit than the 212. It's thin enough that you can get a push-pull setup and still have all four RAM slots available for the future when you decide to drop in another kit.
Or, there's the Scythe Mugen II, if you want a better performing heatsink, albeit at the cost of being a little louder. Those are my two recommendations. The MUX-120 if you want a silent setup, the Mugen II if you want one that performs better.
Just my $0.02.