Final tally:

128k: 1, working

512k: 6, 3 of which have dim/nonfunctional displays

512ke: 9, working

Plus: 9, 1 of which has nonfunctional display

Other notables:

3 of the 512k's have MacRescue's on them with DB25 SCSI ports in the battery bay. 1 of them isn't booting, probably because of a mis-seated MacRescue

1 of the 512ke's has a DB9 coming out the battery bay

1 of the 512ke's has a hole in the back with a BNC connector

1 of Pluses has an amber monitor

Looks like I need to plan an analog board revival party.