MiniYazz if he already has a double, he just aswell buy a triple, whats the point of having watercooling if your gonna have the fans on flat out, kind've defeats the object.
I dont even have a I7 cpu, I am using a Q9650@4ghz which dont kick out the same heat as an I7, using a Thermachill rad, 18w DDC/alphacool top.
Off this loop I am also cooling the two mosfets and a northbridge chip and I get nice load temps of around 50c. My fans are running on the lowest setting, which to me is why most people go to watercooling.
So I stick to my guns have CPU, Northbridge, one loop, GPU's on another.
Maybe you could try a single loop with two dual rads, providing the pump would provide sufficent flow.
My opinion is if your gonna go watercooling you just aswell get the most from it, nice case to have a nice setup with aswell, know what I would be doing with that I7, maybee I am just greedy.