hehe, I seem to be building a reputation in a hurry here
But whatever keeps me busy at work is a good thing, and I haven't gotten flamed too bad yet.
As I seem to keep doing, I'm gonna compare the water-cooling "circuit" to an electrical circuit again. And I'm gonna re-state what gmat just did - parallel rads is a good thing - in an electrical circuit it would be like parallel resistors (rads resist current flow). This would mean that the overall resistance of the water-cooling circuit would be less, which would mean more flow-rate. My post above just explained why IMHO you can never have too much flow-rate - and I'd think that potentially the extra flow-rate from parallel rads could make more difference in CPU core temp (which is what we really are concerned about in the end) than the extra cooling surface of the rads.
Parallel rads = more water at nearer to ambient temp through the CPU block. Except that it takes up a lot of space in the case, I can't see anything bad about it.
As for the whole pressure thing - I've got proof in my own cooling system that our little pumps do make enough pressure to have very different pressure-points in various places in the circuit. In fact - my cooling setup may contain the proof that the BI Prime is actually more restrictive to water flow than the Maze-2. In my system, going from pump->cpu->rad->pump (no res - sealed air-tight) I actually had to re-inforce my tubing from the rad to the pump. I'm using thin-wall Tygon which is VERY easy to stretch/crush, and the suction of the pump actually sucks the tygon closed from the inside on that short stretch of tubing. The lines from the pump->block and block->rad don't exhibit any flattening of the tubing at all. And this is with only a ViaAqua 1300 (400gph) pump, though the thin-wall tubing is what makes this pressure easily visible.