I know this is a thread about the vortec pumps but at $365 I just have to mention this...
For the same amount of money you can up the 3,100gph to 60,000gph
You can get three Mag18's and the parts necessary to make each one put out, an admittedly estimated, 15,000 - 20,000gph (according to the post a few entries down on this page)
http://reefcentral.com/forums/showthread.php?s=&threadid=790770&perpage=25&pagenumber=25
No flames please. I know these vortec pumps are plug and play, no mods necessary, controllable, motor outside, sweet looking, low energy, and all that. I'm not trying to talk anyone into (or out of) anything. I just ran across a $100 pump that puts out crazy amounts of flow with a little modding so I thought I would share the info.
Robb
p.s. I would like one of these pumps too but I'm even balking at the $100 pump LOL