Can somebody recommend me a good quiet 120 mm fan?

Hardware Hub Cooling
2

I was thinking of buying this. http://www.newegg.com/Product/Product.aspx?Item=N82E16835103022

3

Noctua NF-F12, I have a couple of them in my system. You will not find a better, quieter fan.

http://www.newegg.com/Product/Product.aspx?Item=N82E16835608026&cm_re=noctua-_-35-608-026-_-Product 

4

Noctua. The NF-F12 or they do have some new ones coming that look a bit nicer imo.