Thanks everyone for your help. I called Wallbikes this morning to order my fully-decided-upon Flyer... and then Bill asked, "Did you have any questions about it?" Ha! A 15-minute conversation later, and he put me through to Brent from whom I ordered the B67. :D
I still don't know if it's the "right" choice, and I probably really won't until I have it for a while. Meanwhile, it's in the mail!
Biciclista, thanks tons for encouraging me to come back to talk about positioning. If I need to, should I do that here, or in a new thread?

