justme,
The sunon fan is much better, $13.28 each + $6 shipping at http://www.gadgetpros.com/mini5vcooler.html
I have it on my IOs right now, it fits perfectly, no need to trim anything, it's running as quiet as a fly. It cools the CPU a lot better than the stock heatsink, and it also gives me a lot of room and air for my HD since the heatsink is out of the way. In my opinion, $32 for my 2 sunon fans were well spent.