you spend 600 watt just to cool it down? thats stupid.
buy some server fans and run them at 5600 RPM and you will get the same temperatures with just 30 watt extra.
Which Fan?
Nah you want some 7160RPM 38mm's like these 
Anything "Delta" will be FAST rpms, HIGH cfm, extremely LOUD, and use a LOT of power. Yes, caps are warranted on all of these points.
7160 RPM, 252 CFM, 66.5 dBa, and 4.8A @ 12V = 58 Watts. That's just crazy.