If you want to overclock and you are serious about it, go with liquid cooling. It costs no more than a normal air setup, and the performance is excellent. I was aggravated in my builds using AMD processors because I had a hard time keeping the lid on the temperatures. I switched to liq cooling and never looked back. Quiet and powerful. Here are two getting top reviews from Newegg.
Just an additional thought: however you set this up, do not block any airflow from the radiator fan. I added a dust filter to my unit, and the CPU temp went up 3°. Not a big deal because the unit already lowered my temps by 10-13°C but if you are a hard-core gamer it may make a difference. I don't game.