"Absolute best" used speaker for $8-10K

Thank you all for your recommendations. Room size is around 20 x 30 and music is mostly soft rock, adult comtemporary and jazz.
I absolutely love female vocalist like Celine Dion, Diana Krall, Patricia Kass and Norah Jones are just some of my all time fav.
The closer and the more intimate I can get to the artist recording and that is my ticket to audio paradise.

Anyone here have any experiences with Avalon Eidolon as I have heard great thing about them.
Though rarely for sale here at Gon., must be quite an speaker for people hold on to them so dearly. Thank you all.

My current amps is Krell 350MCX, Ayre K-5XE with a Esoteric DV-50S.
Planning to get a pair of Pass Labs X600.5 along with an McIntosh C200 pre. and the ayre C5-XE.
Cable is AZ Silver Ref. II and Hologram II but plan on upgrading once the speaker choice materialize.

Boa2, I'm contemplating on the Andra II. From the Stereophile review it look like one of those rare one that does everthing just right.
Any could share some info. on this speaker with me. Thanks again.