If big fans is what you're after you might try using some 24Vdc 170mm Comair Rotrons, or 170mm Pabst like I have. It would be much easier to rig that up. My Pabst fans are spec'ed from 12-24Vdc and will run all the way down to 7 volts although they need closer to 10 to start. ( I have a seperate starter circuit, but thats another story ) The only advantage I can see to having the AC powered fans is greater flowrate and pehaps mains power vs a power supply. But I can tell you that you wont need more than the DC powered 170mm fans have to offer. I have 3 in my system, 2 push/pull for the heatercore and 1 more to ventilate the case. When they are turned up to 12V my computer room sounds like a walk in cooler. I leave them spinning at a leisurely 1000RPM at about 8 volts, which keeps things nice and quiet and still plenty ventilated. You're going a bit over the top with the AC fans IMO but whatever, its your project. You might need a variac or something similar. I wouldnt try a light switch dimmer if thats what you are thinking... that could be bad.
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