Sure, I can answer those questions.
My listening room is a dedicated room in my home. Dimensions are 23'x16'6"x9'. There are no windows or glass, but two solid-core doors at the back of the room. The room is rectangular (no odd recesses or anything).
The seats are about 11'-12' into the long dimension of the room.
I listen to (95% classical, orchestral and chamber primarily) music about 80% of the time, and watch movies about 20% of the time. (The remaining 5% of music is rock music along the lines of Dire Straits, and blues.)
I do not listen very loudly. Although I'm in my late 50s, my hearing is very good and I'd like to keep it that way. I try to listen at about the same volume as I experience in the middle of the Kennedy Center/NSO auditorium, which I try to attend several times a year (I usually sit around row W, if you are familiar with the space).
Perhaps power is not what I need as such, but dynamic headroom.
I am not averse to room equalization such as Anthem ARC, but I'd rather have the room behave as well as possible before I resort to touches of equalization.
At the moment, I am asking specifically about build and component quality, mostly because I find the discussions about amplifier sound qualities to be tedious. I'm not saying I think all amps sound the same, I'm saying even if they don't, talking or writing about their sounds isn't very productive in my opinion.