I just ordered the u-channel that I plan to use for my build. I was going to go for the large heatsinks but couldn't source them cheaply enough in Canada. Six 6' x 2" u-channels plus one 6' x 4" u-channel all precut for me by a local machine shop for $102. Will probably start it when I get back from MACNA on Tuesday. Really interesting build using this here:
http://www.reefcentral.com/forums/sh....php?t=2026851