Jim,
Depending on your budget some other GaN based amps to look up are AGD Audio, Merrill Audio, Orchid Audio and Peachtree Audio. Outside of the usual suspects from Hypex nCore, Purifi and Ice based amps. I would have added Digital Audio Company (DAC) but I do not know where the company stands since Tommy’s passing.
Personally, i have stopped looking at standalone amps and going down the integrated route going forward. Right now, i go back and forth between the Vinnie Rossi LIO with 30 watt amp section and Ming Da 300b 8w setup.