103 12cm case fans review @ Hardware.Info
 

For those who are looking for an all-round case fan, our efficiency test will be the most interesting. The Enermax Twister Pressure, Noiseblocker NB-eLoop 1300rpm, Enermax T.B.Vegas Quad, and Noiseblocker NB-eLoop 1500rpm are the big winners in this regard. If you're on a budget, the Scythe Slip Stream 120mm 1200rpm would be a good choice, or the Arctic F12 if you'd rather have a PWM fan. Naturally, these cheaper models do use plain old sleeve bearings.

http://uk.hardware.info/reviews/5770...se-fans-review