I had the same problem with my cooler master case and the hyper 212. Ended up switching to the cooler master Hyper Tx-3.
currently have my rig Overclocked to 3.53 Ghz.... still runs nice and chilly under full prime 95 load. (core temps usually just barely reach 40 degrees.
ya haha...i thought as technology progress, things should get smaller...xD