Sorry for the late response on this log! I finally finished the system, after getting special barbs in, I've been running it for a few days and got some overclocks done. I'm pretty happy so far! Looking at some reviews it seems a single GTX 480 at the same voltage (1100mv) gets about 59-60C after 15-20 mins of Kombuster run.
With 2 GTX 480's, 1 GTX 280 and my NB on the loop I get a max of 66 C at the same voltage.
My Overclock on the GTX 480's are running @ 875/1750/4400 with my i7 965 @ 4.0 GHZ.
I'm assuming with a few hours of playing time I'll be at about 70C total on that loop which I'm very happy about. If I didnt have the GTX 280 or the NB on that loop It'll probably be at about 65-66C so I'm glad I put them on that loop!
Well here are my final pics:
Trying out some Red tubing, decided to go with all black.