I'm using a Lamptron FC-2
and it's rated for 45 watts per channel. The thing is well built, runs around 32C, and I currently have the following on it:
Channel1: 4x 92mm Panaflo Ultra RPM (2.7w each) 10.8 watts total
Channel2: 2x Silverstone FM121 (4.8w each) 9.6 watts
Channel3: Laing D5B pump (up to 24 watts max, 18 typical) 18 watts
Channel4: Lain D5B pump (up to 24 watts max, 18 typical) 18 watts
Channel5: 4x Scythe Kama flex SA1225FDB12H (2.88w each) 11.52 watts
Channel6: 4x 120x38mm Panaflo High RPM (6.12w each) 24.48 watts
Total wattage: 92.4 watts.
If I crank up Channel 6 quickly, I can hear a touch of squeal as the fans spool up, but it's only on initial spinup, and disappears entirely in about 1 second. The power connector is 3 female Molex, all into a binding post setup on the actual fan controller. Very solidly built, and I haven't noticed any motor whine.
I almost bought a Rheobus instead, but am quite happy with the Lamptron.