I think I could do that idea one better. Why not beef up the pump a little bit, make the radiator 2 rows thick and 80X80 and turn it sideways from the way it is now (so the edge of the radiatory plugs directly into the out side of the pump/block unit). Then slap an 80mm fan blowing through it and a clear return line going to the input side.
Bingo, all in one watercooler that actually works well

. This one just seems to have an underpowered pump, underpowered (60mm???) fan, and too small a fin area.
Sam