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I'll 3rd the previous posters.
Most of the 120mm fan compatible coolers will do a good job: Tuniq, Noctua, Scythe, Thermalright...
...and the Silverstone FM-121 is an awesome fan.
Lapping is simple, but time consuming and requires ones full attention. There is a link in my sig...
I would try the cooler out of the box first, then lap it if you feel that you would benefit from it.