PLEASE DO NOT get a Koolance. They are not top quality.
Get the MCW60: http://www.swiftnets.com/products/mcw60-R.asp
Get some RAM/Mosfet sinks (DO NOT FORGET THESE!) and you are set! Btw, what pump,rad,etc? Post this in the "Cooler and Heatsinks" section. The only 4-5 WCer (including me) are there only.