I would use something that has got a lot of wattage per channel personally,using 2 fans per channel on a 6 fan controller would be my idea of using so many fans.
NZXT Grid. 10 fan hub for CHEAP.
I'd wire them all up to PWM to 3 pin converters. Automatic fan control is so much nicer than fiddling with dials and knobs.
I plan to have 10 fans (4 radiator, 3 radiator, 3 case). The fans will be Corsair SP120 High performace 120mm. Can I put multiple fans on a single fan knob? i was thinking of using the BitFenix Recon.