Well, my SM reg question has solved itself. I won DRIS' Dunkin Punkin (aka underwater pumpkin carving) contest today (2nd time in a row, too!). My prize was an XTX50 DIN reg! I'll pair that with the one currently on my pony, get hoses, etc., as well as the 5th port added, and I'm set. The money saved will go towards my Perdix.