You would probably be better off with the 801 version of the fan vs the 800. I have the 800 and wish I had ordered the 801. The small difference in noise vs the extra 4.3cfm of air flow would be nice. With that said, the only time it would really be needed is when you are doing a pre-clear or running a parity check/write.
http://www.quietpcusa.com/Coolink-SWiF2-801-Quiet-PC-Cooling-Fan-80mm-P691.aspx