Best all around box speaker between 15K and 25K

You might want to add used Cello Grand Stradivari Master (Dynaudio driver version) to your list. It's rare on the used market. However, it's still unforgettable and collectable.

I know these are great speakers but they have a low sensitivity and require more than 300-400 watts of tube power to get them to sing. Really good tube amps at this level are over 20K.

You are referring to the Avalon Eiodolons

none of what you have listed are worth anything!!!!
I take it you don't listen to much music. The only question you should have asked is, "is there a better speaker" than ATC'S log on to canadahifi.com to get some info, their about the only speaker used in recording studios around the world. They were used for everything from the movie lord of the rings to remastering pink floyds dark side of the moon to abbey road the beatles. They are the truest, most natural speaker made in the world!
Good luck

Cshouse007- Have you heard all of the above? If not I suspect your claims are suspect!