Wow, thank you all so much for your replies! I came home from a day at the darkroom to find so many helpful and thoughtful answers, and of course, so much more to think about.
Evilhomer, everytime I look at the Bronica gs-1 online I think about your Sq-A. You are still happy with it, right? I realize it would be smaller than the gs-1, but the sq-a is certainly a fine size.
Tomkatf and resoman bring up interesting points about the aspect ratio…I do tend to print my 35mm full frame, so perhaps 6x9 is really more what I should be looking at. Hmmmm. If I looked into the Fuji GW 690 would I feel limited by the single lens? More to chew on.
I may just end up abusing the return policy at KEH.