Wide dispersion + high efficiency + detail + coherence in a speaker?

atmosphere,
That sounds like a heck of a speaker.  I've only heard one or two of the Classic Audio speakers at shows and enjoyed what I heard.   If I had the space I would definitely have tried out horn speakers by now, but they just don't fit at all in my scenario.
(Btw, something fascinating to me is how, as counterintuitive as it may be, there is something of the character of various speakers that actually seems to come through on the many youtube demo videos.  Sometimes it seems like the character of a lowther horn speaker really comes through, a sense of liveliness, dynamics, or just the more "full" and chunky sound seems to be present vs recordings of other speakers  (sometimes you can even hear the horn honk coloration on voices...I know some horns don't have this...). 

Totem does everything well on your checklist!

The only speaker I have personally auditioned that fits all of your criteria, and does so very well, is the Coincident Pure Reference Extreme.   It is 26K.  I can also say that I own both the Coincident Super Victory II speakers and the Triumph Extreme II monitors.  They both have superb coherence, as defined by mapman above.  They both sound like single driver speakers, as does the PRE.  I have not heard the Total Victory or the new Dynamite.  The PRE and SVIIs I would characterize as lively, but the SV II has a laid back demeanor.   The Coincident speakers run from 92.5-94 dB efficiency, depending upon model.   As always, an audition is mandatory.   

Brownsfan makes a compelling point regarding Coincident speakers, very coherent. My Total Eclipse II is a big speaker(52"height and 170 pounds) 3 way design with 5 drivers. Despite this they disappear with most recordings.  You aren't visually drawn to them as the source of the sound. They create palpable images and stage and just get out of the way.

I've heard them in my room with about 6 different amplifiers and this vanishing ability is consistent with most recordings.  Some early stereo recordings do sound 'hard left and hard right'. Those are the exceptions.
Charles 

sometimes you can even hear the horn honk coloration on voices...I know some horns don't have this..

You are right- some horns don't have that at all. It all depends on how well the throat of the horn is designed; many don't have the benefit of computer optimization but some, like the Classic Audio Loudspeakers, do. This makes them very free of any 'traditional horn' artifacts. The Kapton surrounds help as well, since the driver won't break up if driven at too low a frequency.  Often you can't get away with a 6 db slope on a compression driver, but the Kapton surround allows for exactly that.
Take a look at some of the AV Showrooms videos on YT. Peter never seems to have any complaints about the Classic Audio Loudspeakers.