Yeah, thanks. That's something I've thought about quite a bit. Because I always had live performance in mind, I decided to forego stereo. Everything is running into one bass amp, so there really isn't a point there (and even in the hypothetical case of a bigger show with a house pa, I don't want to mess with it). But it's also a matter of hp. I'd have to give something up even to put in, say, NE Xer Dualis (which I had in there), and I'd want more utitilities to manage stereo paths. For recording sessions where I want stereo, I think I'll just have a small stereo breakout/mixing case that this can run out to.
One real bonus of going mono, though: it allows me to use the Arbhar's onboard reverb!