Two Pumps?

I plan on having a multi radiator and multi reservoir setup, I was just wondering for each of the reservoirs do I need another pump or will one pump do just fine?

-The pump I plan on using is the Innovatek/Eheim HPPS PLUS 12v Pump
-Innovatek HTCS Convection Radiator mounted on top of the case
-2 Innovatek InnovaKonvekt-o-Matic MAXI mounted on the sides
-2 Innovatek External Tank-o-matics on the sides
-A Fass-o-Matic in the drive bays

Yes its overkill, but... so what.
I love Innovatek as you can see; I used their kit 4 years ago and loved their stuff since.

A Core 2 Extreme
4 WD Raptors
2 GeForce 8800 GTX

Okay, them Raptors should be fine with a fan cooling. Trust me with a fan they would be at great shape. As for the rest you can do the same as Wun and go ahead get two separate loop, one for the cpu and the other for the graphics card.

Or you can do it with single loop and use a 4x120mm rads, MCP655 pump or better, then split it off to the three components, or if you overclock only the cpu then go ahead place the setup to pass the cpu block and then splits off to both graphics cards. The graphics card will be at 60-70c by then but 8800GTX can run on that temps no problem. Also use push-pull fan configuration for better cooling on them rads.

But if you have enough space in your rig and or don't mind having external rads then use two loops by owe means. Also for heavy overclocking then you need two separate loops.