The Xigmatek Gaia is a little cheaper, and a little better than the more often parroted Hyper212 EVO:
http://www.techreaction.net/2011/07/07/review-xigmatek-gaia-sd1283/7/
http://www.techreaction.net/2011/11/27/review-cooler-master-hyper-212-plus/4/
Unlike the Hyper212 EVO (ignore the URL; it IS the EVO they tested), the Gaia never throttled, although it wasn't always the coolest depending on the fan used. Both got awards, but the Gaia is usually cheaper as well, making it the better choice. NZXT also has a similar 120mm cooler that is even cheaper right now (it's a new product) and would be a good bang/buck choice. Not that the Hyper212 EVO is bad, but it's a bang/buck Loser since you're paying for a name.
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To answer the original question though, if you're not overclocking, the stock cooler should be fine. It is also going to be fairly quiet.