http://www.silentpcreview.com/article63-page1.html
But avoid the Noctuas, it turns out they are among the best in open resistance-free environment but in real-life applications their performance drops more than other top fans.
NewEgg is finally stocking SilenX fans. I was about to stray from the Egg just to try these on my summer build, but i don't have to. At least it keeps me from having to order from more than 2 e-tailers.I would like to mention the new SilenX fans (120mm) also. They have fairly decent airflow vs noise performance.
NewEgg is finally stocking SilenX fans.