I'm looking for some recommendations on a quiet CPU cooler for an i7 3770k. The CPU won't be overclocked and I'm looking for something that's less than $50. I'm mainly interested in maintaining low noise levels. I currently have a Zalman CNPS9500AT for my Core 2 Duo E6600 that I'm replacing and am happy with the noise levels of that fan. I was thinking about just getting another one of those but I'd like recommendations for something better/quieter if possible.