OK - After looking at the Razor and OMS solutions more carefully, I've now got a couple of more possibilities to consider.
Northwoodsdiver, true, with the Razor you have no wing, but you're right, most of my local diving is dry, so that isn't an issue there. For travelling it's not an issue either, just a quick weight check to dial in on the first day.
To tell you the truth, I didn't give OMS much thought. Now after really reviewing it, I'll consider it also.
I just hope that this thread has helped some others in considering what SM systems are out there, and how you can approach this. As I said in a previous post, My primary concern isn't even tight spaces at this point. I just would really like to get the doubles off of my back, and I've always liked the idea of managing tanks in this configuration. I guess I've just made the decision to move in this direction, but want to do it right - one time.
And to all who've been giving comparative descriptions, you've helped a lot.
Thanks,