You have a good short list of SS already. If I were in your place, it would depend on the ability to get some test drives with some candidates and my willingness to eat some shipping costs in the process. The Music Room would give you two weeks with gear they're selling.
As far as names go, if I were to just add a few used options to your list, I'd look at this list : https://tinyurl.com/3hvtcdrt
at PS Audio, Bryston, Parasound A21+, Peachtree GaN400, Balanced Audio Technology