Not sure if you seen it but check out www.savko.com for fittings and ball valves

I had a old Rio on a tank and after I upgraded it, I turned it into a utility pump (live rock bin).

Is your fuge inline with your sump? (I.E. drain area -> skimmer area -> fuge -> return area)? Flow might cause the cyno to build up in the fuge, but I'm not sure. You have a tank similar to the one I'm setting up. I'm going to be using a Dart for the return. I was kicking around the idea of a Snapper but the Dart is only $30 more. Plus if its too much flow, you can put a valve on the exit side of the pump to reduce flow (by reducing the flow, you subsequently reduce the power consumption too). I read on Reef Central that the Snapper is the same motor and housing as the Dart. It just uses a different impellar. So if you own a Snapper, you could spend roughly $30 to upgrade it to a Dart.

The 4-way is really the only common closed loop oscillating device I have seen. The SCWD wouldn't work too well on a tank that size....unless you use a bunch of them. Some other options could be Sea Swirls/Wavy Sea on returns. But those add up too