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#21
If you put an exhaust fan in the rear of the case, you won't need to add a second one to the HSF. I would get another CoolerMaster fan like the one on the 212+, as they move a decent amount of air and are quiet. I have two of them running on two systems, one is an always on server, and I would call them very quiet.
Just remember that CPU cooling doesn't stop with the HSF, but relies on the whole system as well.