Review on Corsair ML120 Pro LED Red Cooling Fan: Premium 120mm Magnetic Levitation for Optimal Cooling - CO-9050042-WW by Aaron Vang

These are the best fans I've ever had. Not cheap, but at 2400 rpm they're almost inaudible. At 1600-1800 rpm they are completely silent. Edit: 1 year later these are still the best fans I've ever had. Quiet, quiet, quiet. When I measure actual performance at maximum speed, the fans run at around 2630 RPM instead of the advertised 2400 RPM. But even then, with the case open, they're nearly inaudible. They are also very stylish, don't you think? You will be the judge. ☺