Uh, the kuhler uses a standard 120mm fan. It says so right in the spec sheet. For good fans you can read some reviews as to how they perform relative to your personal preferences. (price/performance/noise)
Its all subjective I don't mind loud fans as I have a decent headset and don't really use speakers.
I guess I would recommend the Gentle typhoons or some other good static pressure fan.
If you are going to mount it horizontally do not get regular ball bearing fans as they die extremely fast and make more noise when mounted horizontally