[zoson]

Opinions: watercooling your northbridge is STUPID. I did it, and I feel like a complete RETARD because I did it. My nbridge temps are CONSISTENTLY higher than they ever were even with the POS HS+POS TIM that came stock with my mobo. Any of todays high powered cpu's and gpu's will keep your water temp higher than a northbridge normally runs at.

Pumps:
Eheim 1250:
Pros: quiet, shielded magnetically, 317gph
Cons: HUGE compared to other 300+ gph pumps, $$$$

Hydor L30:
Pros: small, 300+gph, quiet
Cons: No shielding, crappy compression fittings, $$$

ViaAqua 1300:
Pros: smallest of the three, 370GPH, quiet, $$
Cons: No Shielding, runs ~1W 'hot' compared to eheim and hydor

I've used both the eheim and the viaaqua (but NOT the hydor, I'm just going on what I've read and see in pictures). I would DEFINATELY reccomend either the eheim or viaaqua, but currently I am using the viaaqua. It has a higher flow rate, and it's much much smaller (good for my space constraints). I would also dare to say that the viaaqua is more quiet than the eheim, and doesn't vibrate as much.
-Zoson