I personally use the
Noctua NH-U12P
I have yet to experiment too much with the overclocking, but what I have so far it cools great (3.8GHz 55c max load, 4.0GHz, 62C max load , and that was just changing the FSB on the E8500, no other settings). Also, it comes with one of the NF-P12 120mm fans, and they work great.
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Photoshop User. Crysis Player. Prime95 abuser.
I like things that can flog my system :p