erh...u need a lil excercise and get ur butt off the PC?
Dunno why you guys all like to make your life so difficult weih.

One 120MM fan, blasting in front of your hardrives make your life much easier and frankly, I think that's the only thing you need.
However, heatsinks from your old Pc's make a good extra but are they REALLY necesarry?

Servers don't got big ass heatsinks sticking onto they top. They stack all the HDD's on top of each other, big fan blowing and they're done. Noisy tho...hmm