Since I have time and I wanted a complete picture about the 120mm slim fans, I have done some research: first of all I would like to avoid all LED/fancy fans such as Phobya (yes they do a slim line) and Scythe Slip Stream since are too noisy. Also GeIL are too much for my taste since are blue
I know that are pretty good since SimpleModz is using them in 250D build, but are not for me. In the end I found: Silverstone, Raijintek, Prolimatek, Deepcool and Akasa.
I don't need a huge amount of airflow, I prefer silence and PWM header. I haven't decided yet but I have done a table that can help also other guys