If you are not overclocking why do you want an aftermarket cooler? The included Intel heatsink is sufficent for any stock CPU.
If you want something for ~$50 that is better than a Hyper 212 take a look at the Scythe Mugen 3. Scythe coolers are known for their low noise as well. My Mugen 2 is nearly silent.
looks good, probably what I'm going to get. Thanks!