If you looking for good value, performance and quiet operation, then look into Thermalright HR02 Macho and Scythe Mugen 4.
The Thermalright looks to be as gargantuan as the three I was considering:
Cooler Master Hyper 212 EVO
I found complaints on all three either not fitting a full-size tower case, or overcrowding other components, or impeding air flow, so size is definitely a concern. The Scythe Mugen looks to be more reasonable in size. At the moment, I think its a tie between Scythe Mugen and the GELID Solutions CC-BEdition-01-A 120mm. Which do you prefer?