Btw: I use the sm200 and the red dragon 6.5m because they use the same block. So my extra block can be used for either pump. I like this idea better than having two different red dragon pumps (big block and small block).
I myself don't forsee ever changing to the dc pumps because it doesn't really do anything special that my current pumps don't do, same wattage usage, and same water/air mixture. I don't ever need to adjust the speed of my skimmer or return pump, it's simply on or off. I could see using a dc pump as a closed loop pump though, cuss programming the pump on apex to ramp up and down on the closed loop would be pretty neat!! That would eliminate having to use an oceans motion device or something of the sort since the pump ramping up and down will create the same thing.
I agree with not switching to the DC version. My skimmer works great with the standard AC version. Funny you mention using an Ocean's motion unit, I have one and I love it.
In terms of the pump, which Laguna model is the right one for my pump?