OK....gotcha now. But I have a suggestion.....
Try this...
I don't think that the GPU would put out so much heat that it would "contaminate" the coolant for your CPU, plus it's going to the next RAD, so you shoul be good to go. Plus, I think that it will give you a little neater setup, and may even be cooler. The flow rate with that pump might be a problem, though. But maybe not. Just a thought.