Thanks for the info.
Coincidentally, there's a big storm in the UA forum now about some new "enhancements" to their FF program that were announced after I started this thread.
Stumblefoot - given the domestic nature of my trips I think my "miss list" would probably be down to about 2 - 1st class seats and route frequency.
Any opinions on the stretch seating? Is it just seat pitch, or are the seats a bit wider too?
F9 is looking pretty good right now.