I ended up going push pull on the two fan radiator with a couple silent tornados (cant remember the name but the ones that get good reviews 1450rpm push and one of the swiftech fans in pull. The pull is thermostat switched along with a bunch of case exhaust fans with the temp sensor on the gpu. The push fans are plugged into the motherboard so they run continuously. Makes a pretty quiet machine unless it is crunching.
I would put the temp sensor on the cpu next time and put the cpu first in the loop. Maybe go with two pumps and a bigger case with triple radiator. But what I have will keep it running even on hot days, so it is just enough. Cpu temp is limiting factor and it it motherboard protected so it just powers down if too hot. Cpu runs 81-82 deg with everythink cranking in hot weather.