Must Hear Speakers in $10K range

When I did the speaker shopping thing a couple years ago, the most impressive to me were Aerial, Vandersteen, and the PSB Synchrony Ones, though admittedly, the Synchronys didn't really impress me until they were hooked up to a really good amp (a BAT VK-600, though I doubt they need something quite that monstrous to wake them up.)

I was not impressed with any of the under $10k B&Ws.

I ended up with Vandersteen Quatros (cloth).

Reference 3a Grand Veenas

Another vote for Daedalus speakers. They're great with either quality solid state or tube amps, and they are almost as beautiful to look at as they are to listen to--almost. They do come up used once in a great while. I bought mine used about a year ago, but I haven't seen a single pair for sale since. Most people that get them tend to keep and enjoy them!

Good luck with your search.

Since no-one mentioned them I will. You might also want to consider big Soundlabs. They can be had used for well under $10k and can sound incredible with the right amplification. Need enough room though to sound their best.
Some really like Atma-Sphere amps with them, and Viva. Others use big Rowlands or something like that.

Avalon Eidolons
Green Mountain Audio Callisto
Thiel 3.7's
Rockport Mira
Wilson Sophia II