I have a 120mm Panaflo L1A with a 3w 25ohm rehostat connected (from radio shack), i just fine tune it to fit my needs. Enermax sells some nice 120mm fans with a rheostat built in, goes between 1500 - 2300 RPM with a max of 94cfm of air, I have one on my dads PC and its pretty quiet at low - mid settings.