Why limiting yourself to these 2 choices? If possible get the Scythe Mugen 2
, which is only $40 and took 2nd place in this roundup
, or get the Prolimatech Megahalems
if you don't have the clearance for the Mugen 2, the Megahalems isn't tiny, but it's a great performer and has one of the best mounting systems out there, but it costs ~$63 as well as the cost of fan(s).