Speakers in 10-15K price range for Classical music

For classical orchestral and choral music, I would suggest you make a real effort to audition Shahinian Hawks or Diapasons. They are designed by their creator to model as closely as possible the sound of an orchestra playing in a concert hall. They provide an extremely convincing spacial and timbral recreation of that sound. In addition, they boast very dynamic, concussive bass, an enormous sound field, more sense of 3-d ambience than I have ever heard outside reality, and a string sound that is palpably rich, realistic, and velvety.
Very importantly, they will play very loud without strain or tonal variation. I can listen in my 2200 cubic foot room to Mahler's Eighth at close to actual live-concert-level volume (peaks of 108db) and the sound is as good, clean, undistorted, and easy on the ears as at 80 db. This takes a good amount of power and current though (I use 2 Plinius SA-100's).
The Shahinians are polydirectional above 250hz and use a transmission line woofer terminated with a passive radiator.
They do not do pintoipnt imaging. Of course, neither does the Berlin Philharmonic or Miles Davis. If you want razor sharp images, unlike the reality you hear live, these are definitely not for you.
There are no US distributors so these can be purchased only from the factory at about $12,000 for Hawks, $20,000 for Diapasons. A used pair of Hawks just sold for $3200 on Ebay.
If you listen primarily to large force classical music, or any acoustic music recorded well in a live space, Shahinian's top speakers (or even the Obelisk, at $6000) are very, very hard to beat.

I'd like to add this to my previous comment:
The reason I went to Shahinian Hawks in the first place (they replaced Alon Circes with a Thunderbolt sub and a factory supplied, custom designed x-over, not a bad system for classical) was that the Shahinians, in addition to displaying all the virtues I mentioned above, also "filled in" the enormous upper-bass/lower-midrange power and presence of live orchestral music which seems so often to be missing in reproduced music.
Admittedly, some hear this as "bloat" or excessive "warmth."
However, in a good hall, a full classical orchestra actually produces much more impactful physical power in just that area wherein which dwell the cellos, the trombones and horns, and much of what makes the violas and even the violins sound so rich and full.
The Hawks capture the force of this power without too much of a compromise in detail and clarity, for which I feel they also compensate with excellent timbral accuracy.
These remarks come from a listener who loves more than anything on earth, except life itself, the Western classical orchestra. Please consider that when trying to apply any of this to your decision.