I am on the hunt for a good(quiet) CPU cooler for a Intel i5 2500K that will be OC a bit. This CPU is placed in a Fractal Design R3 with orginal fans(2). Regular memmory modules is used (no extreme heatsink).
I hade the Arctic Cooling Freezer 7 Pro on my Q6600 OC that i was vary pleased with but I supose that this will not work that good on a i5.
Antec Kuhler 620 In my book. If you can't afford it wait until you can. Side bonus of water cooling is that CPU heat is directed and vented straight out of the case, meaning lower circulating air temperature for all components.