Speakers with the most detailed midrange? (non-ESL/planar)

Most if not all the speakers in that price range will and should have excellent sound across the entire frequency range. To retrieve the sound or put more or less emphasis on certain portions of that range will greatly depend on the amp/preamp combination. For example, a traditional sounding tube preamp could put more emphasis on midrange when compared to a more neutral SS preamp. Same with amps, tubes vs. SS.
Ultimately the system synergy is what makes all the difference in the sound quality.

The Graham Audio LS 5/9 will give you everything you are looking for, one can hear far into the recordings and follow different layers on the recordings but still hear everything as a hole, also you can listen for hours on end without getting fatigue, a fantastic speaker.

@woofer72     you can get hundred feedback with suggestion,--My speakers which are using now is the best for detailed midrange.
  Try to find and listen . first-only 3 way loudspeakers , Midrange is 
preferable 8" or more with extended . wide range driver  with 
no crossover in more critical  region. We make this,  If you close to NY
or NJ you can get chance to listen

Look for speakers that use drivers that are actually pistonic throughout the midrange (and treble, too).  Price no object, Vandy 5 and 7mkii, as well as most of the Vivid Audio stuff.  

It is likely that the new Paradigms with the beryllium midrange are pistonic, but I'm not sure (and haven't heard them...they seem to bit a bit divisive based on comments I've seen here).

It’s probably going to be a three way speaker, as the given two way speaker will have some minimal issues of some sort in the frequency range you specify.

That the frequency range you specify is almost the exact full covered range of a given average three way’s midrange driver.

It is also, for some basic acoustic and technical reasons.... the hardest part to get right.

This is the big money range, where the mid driver, if done as best as possible.... might start to touch $1k or more in costs.

It’s just plainly, a brutal set of incongruent requirements, a set of mechanical, magnetic, and electrical complexities where the pairing of that with acoustic issues, all fight against one another and individually within themselves.

That’s a midrange driver.

It makes tweeters and woofers look easy. And they’re not.

How far did they have to go to get close?

It’s a standard high end loudspeaker designer’s dilemma: Walking through the endless desert, begging, crying, looking for ---a perfect midrange driver.