G,
Initially I was looking at all possibilities. However what I found that I wanted to focus toward was keeping SPS, but in the most efficient manner. I went through and broke down the investment cost of more flow and decided I'd rather invest the money up front toward equipment that uses less power and maximizes flow than going to excess. With the 8way or SCWD you need a fairly large pump to drive the force, and you will lose a decent amount of energy just by the SCWD operating. I am utilizing minimum flow through the sump, while maximizing the flow in the tank. I'm doing that currently with one Vortech and will be getting another as soon as I can. The controller that I select will need to be able to control the pumps back and forth to create a best tidal environment, again for the lowest wattage. I also didn't want to deal with excess heat issues and therefore through lighting and pumps wanted to minimize the input that they have on the heat issue. Hope that helps.
~Matt