I'd buy a
PolarFLO HDD46 Copper Dual Hard Drive Liquid Heat Sink instead.
It's a pretty nice design with copper, delrin and low restriction, I'm thinking about building something similar to cool my PSUs and HDDs.
I stumbled over
this auction yesterday. I asked him how much three of them would cost and he could sell three for $50 each. I would have brought three if it wasn't for the killer shipping cost to Sweden, $100!