How to select a pump?

[Camaroz06]

Hi All,
I am considering watercooling for m current build:

EVGA 750i
Q6600
2 x 8800gtx

I would like to put the CPU, motherboard (North/Southbridges), and the 2 GTXs on the loop. I was looking at a large rad. (3x120). for the loop. What would be a good pump? I sorta get sonfused when it comes to the pumps since there are so many.

Thanks ahead of time,
Eddie

 

[leSLIe]

so u want the correct point of view (Mechanical Engineer version ) or the enthusiast point of view?

 

[Camaroz06]

HA, the one that will cost me least money!