Hi Evan,
I really do appreciate the advice and reasons that you have stated. Since I really like rtty/bpsk style modes as well as cw, I will most likely go for the sbitx model. Also, if modification is needed to bring the ubitx up to what I want, then I am best to start out with the sbitx. I do enjoy ssb from time to time too though. When on a limited radio equipment budget, planning is needed. Not sure of the portable antenna yet, but it will most likely be no larger than a 20 meter inverted vee so that it will fit in a camp site with our pull behind camper at state parks. I might try making it multiband with a tuner and twin lead cable.
Many thanks, 73
Scotty
Scotty R