Most GPH for the buck?
 

Well I've caught the folding bug and I plan on setting up a bunch of headless folding boxen and I want to watercool them. I want to try and use one or two pumps for 5-6 cpus. What pumps have the most gph bang for the buck? I was thinking of the higher Danner Mag Drive (I think 1200gph) if it two loud and big maybe two 700s.
Anyways thanks in advance....

Errr... I think that if you are going to cool 5 or 6 CPUs, that you can afford to go for the IWAKI pumps.

We've had a discussion like this before, about cooling multiple comps... I believe that the conclusion was that multiple small pumps was best, but I don't remember why... Either way, if that's the case, you can buy Rio pumps in bulk:D

http://www.puddleandpond.com/nursery_pro_pumps.htm

Try the NPU1000 or NPU1500.

http://www.puddleandpond.com/nursery_pro_pumps.htm

They are a bit pricey (you should be able to find them up to $40-60 elsewhere), but they will definitely do the job. The numbers that NurseryPro advertises for flow rates and head pressure are understated by quite a bit. I'm running a NPU500 and it gives massive flow in a single CPU system that narrows to 3/8" in places. These are designed for 3/8" use ... I'm sure they'll fit the bill. Plus, they come with a 3yr warranty (if I remember correctly) and are designed for constant heavy use. A pump this size, though, might be best used in a resivoir for extra cooling on it (a 90W pump can create a ton of heat). Anyway, I hope that helps.