OK, the continued saga. Yesterday it worked in the am, but stranded me again in the pm. Per further discussion with Jedi Master Toybreaker, we decided it had to be the starter. I rounded up three Marines (a few good men) from a local recruiting station to push start me, and made it home. Finally got ahold of a VOM and checked everything electrical. Tested the starter at Autozone 4 times, all good. Tested it back on the car (not fully installed, but wired in) and it worked 3-4 times, then stopped. Tried that method again tonight, worked twice then stopped again.
Put in reman for now, and everything is working. I guess that says the no-load test at AZ is not really a good indicator of health for cold weather and cold oil load.
Anyway, looks to be healed, so thanks to everyone who had input, and to my cousin and uncle for helping me as well as loaning me a car for a day.
How hard is the starter to change out? Can it be done with the intake manifold on? I've unbolted it many times for a clutch job, but never had to take it all the way out.