I'm impressed with the amount of helpful, educated information I got in response to my question. My short list is not quite as short now: Bryston, Benchmark, Simaudio, Devialet, Naim, Hegel, Ayre. Maybe STR (which I'm unfamiliar with).
I have a blank Excel spreadsheet waiting to be filled in.
And, no, even if letting electronics determine which speakers you own made sense, I'm not opening a barrel of worms by even thinking about replacing my 14-lb Harbeths. As a former long-time Quad ESL-57 owner, I'm impressed with how close they come to emulating some of the ESL's best qualities. They're remarkably accurate from 40-50Hz up and -- one reason why I was originally interested in the Devialet -- are said to extended down well into subwoofer territory when playing Devialet-SAM-enhanced content. Also, I live in an area where finding a house with even a 15'x20' room for under $2M is tough. So "small & light" applies to speakers, too. So that's what I have to work with.
Also, with no friends or family within thousands of miles, finding someone to help me move audio gear around is as impossible as flying all day to visit a dealer or trade show.
Anyway, thanks again for everyone's help, regardless of whether a recommendation made it onto my list.
And I'm still open to more suggestions.