[Zogthetroll]

well, conventional wisdom is that its best to have the res before the pump inlet, as having a lot of restriction at the inlet is a bad thing. causes cavitation (makes the pump noisy, inefficient, and adds air bubbles). as far as whether its better to have the block or the rad after the pump outlet is kind of a toss-up. whole threads have been devoted to that debate. so do whatever works best and gives you the easiest routing.
*edit* oh yeah, welcome to procooling.