$16K new/used speaker question?

If you can find just very recently discontinued demo units of Bowers Wilkins 802s at Magnolia Show room in your area, these are in a totally different league than any models mentioned above. I went to get them myself (as Best Buy offers 24 month interest free financing) and saw another audiophile buying them for $9 grand!( Darts, he had arrived half an hour early on a weekend) !!  They were barely broken in :((((((, with boxes and free delivery. And for $14 grand you could get yourself a demo pair of Bowers WIlikins 800 D2s .. I ve seen couple  of them at the dealers in NYC..... Now we are talking no holds barred level of refinement. Just make sure you get two external run of CArdas Golden Cross speaker wire and bi-wire them. Don't ever use single wire sets or jumpers on these, as they sound too bright...

Also you could get a brand new pair of Chario Sovrans from Italy. They are about $16  grand list, but with $/euro being what it is, be firm and I'm sure you ll be able to get a pair .... Try Canadian distributor if unable to find a willing dealer in the States...

If you have a chance try to listen to the pair of Eminent Technology 8bs... I ended up with them instead of the  those demo B&W 802D2s that had sold at the Best Buy... And they are JUST $2500 plus $250 for almost mandatory Sound Anchors stands which elevate their sound even further ....

Also Sonus Faber Elipsa are very musical and I ve seen them BRAND NEW for about the same price. Just make sure the sound is not too warm , and too sweet. These and the Stradivardis are about the best in their line up.... The Bowers Wilkins have a deeper and better imaging and soundstage thou, but Sonuses sound sweeter and with certain rightness to them ....

If your preference is new you can't go wrong with the Acoustic Zens. I heard them at RMAF a few years back and for the $ the best I heard there. Good luck in your search!

Try the new Ryan speakers top ,of the line. I heard them One of the best I have heard

After reading the comments from your original post, a brand that has not been mentioned and that I have had complete success with are Usher BE 10's. I have had numerous Wilson products starting with the 3/2 up to the 8's and has out performed them in every way. I have a pair of Carrie 211 FE if I'm not mistaken are close to the wattage output of your gear. They are rated at 91 DB and 8 ohm load with no huge impedance swings. I suggest taking a serious look at them and note their driver selection.
Happy listening,,,!