Well, I'd stick with Thermalright's products and go for a Thermalright HR-03 Plus. My friend has the HD2900 equivalent, and idles at ~45C and peaks at ~65C. Excellent cooler, even if it's a bit pricey. Just be sure to get a quality 92mm fan to go with it, such as a Scythe S-FLEX, or SilenX. I have two of the latter, one for my case, one for my Thermalright Ultra-120 Extreme. They're very quiet, and reliable.
Hope this is helpful.