This Noctua NH-U9B SE2 is very quiet. Is it out of your price range or something? For an extra $30 you get great mounting hardware, and 2 very quiet fans. I'm sure anyone who has used a Noctua fan will tell you Noctua fans are pretty much completely silent. I can barely hear my rig, despite that it has the 2x 92mm Noctua fans, and the two front 120mm fans + the 140mm top fan the case comes with. and I'm not even using the ULNAs (Ultra Low Noise Adapters) that Noctua gives you to make the fans slower and quieter.