Server power supplies with breakout boards that are 93% rated and kept under 80 percent load are not that loud.  I replaced all my 90% rated server supplies with the 93% and they are much less noisy.  I use the pico power supplies with a special built cable ( 6 pin to 8 pin ESP & barrel plug) that connects to the pico.  But if your looking to resell the PSU's when done then i prefer the Corsair I series because they monitor power usage (as I use 240v) quite easily. Once I know I have a stable rig, I convert it over to the 1200w server psu's.