forget the thermaltake.
you want either a vantec aero.
or a coolermaster aero 7 plus
the vantec has the motor on the outside ring of the fan. looks sweet and has good air flow to the center of the heatsink. and cheaper than the cooler master unit.
the cooler master uses' a squirell cage fan. i can tell you it works well from personal experience. its not very loud even at full speed and the 7+ is also variable speed.
Well i got the coolermaster Aero 7
And right now the CPU temp is sitting at 30C so I can guarantee that it works well. I dont know bout the other one I have never used it.