I highly reccomend this HSF
I own it and am very pleased with it's cooling. it is made of pure copper, and it is heavy for its size. if you want a cooler that performs well, and does not sound like a blow dryer or worse, get this. And you can't beat the price $20 USD. I put a TT smart fan II beacuse I don't like heat, and don't care abput noise.
Also, whatever HSF you decide to get, make sure you get this:
best stuff there is, even if you don't overclock.
One more thing, clean out your case and heatsink with a can of air once a month/ every now and then.