MiniMonitor 33lbs w/realistic vocals,not bright.

Harbeth, or Proac.

Well, I got a pair of old Sonus Faber Cremona Auditors and they are just great. So much better than the Quads (12Ls, now used on my computer, doing a nice job there for youtube).

The Auditors have really smooth but lifelike gorgeous vocals, the bass is solid with some hints of deep bass, highs are sweet too. They aren't totally transparent but they throw a very credible soundstage that sounds very right to me, and they sound driverless. Overall, I think I like them better than my Harbeth SHL5s (I like the vocals better in the Auditors, no ringing and more rounded with better texture). But they are very different speakers from the Harbeths, which have a fuller big speaker sound with bigger images. But I like the tonality of the Auditors better, with more detailed texture. I never had Sonus Fabers before.
I'm looking for some good speaker cables for them now.

(The only problem is I like them so much I'm eyeing the Guarnari Mementos, but I need to resist the upgradeitis bug, at least until I sell some old eqpt. & cables...)

Legacy studio monitors

Usher be-718

I went through about a dozen small monitors in my office system. I would stay away from active studio monitors for what you are seeking here. They will likely not fit the #1 & #3 criteria in your OP. For what you seek here is my top 5:

1) 47 labs 4722 lens. Magical little speakers that have bass down to about 40Hz and are a little rolled off on top. Hard to find but you should listen if you can. Very small. Of all the speakers I've had you seem to be describing this one. I like them with my MC275 so a small tube amp would work. A gaincard or switching amp might be best though. I'd recommend 25wpc-50wpc.
2) Von Schweikert Unifield One. May be a bit over your budget but these speakers are awesome! The clarity and detail I heard with pro monitors without the fatigue. I listened on both tube and ss and they sounded nice on both.
3) Harbeth hl-p3es-2 sounded very sweet but for me they needed a sub. They also sounded best with a larger SS amp.
4) Merlin tsm-mxe. The are transparent and very dynamic but they seem to be quite sensitive to upstream components and recording quality, this may cause some issues in the highs for you. I found they work best if you have some space around them and you have some distance from them. Not their best in the near-field. Bass was plentiful, tight, controlled and not boomy at all. They too remind me of active studio monitors.
5) Green Mountain Rio. At 40+ lbs each these don't meet your weight limit but they are not too big. The cabinets are made of a stone-like material. These sound really good and dynamic at low volumes so they might be a good match for a bedroom system. They are dynamic and have excellent bass control. They might be a bit to "accurate" to give you that silkiness you seek.

hope that helps