Best full range loudspeaker for the used price of 10 to 13,000 dollars

at that price range you can get reference quality sound.  The most immediate thing I noticed about your current speakers are the 90db sensitivity. If you're going to be spending that kind of money, there's no reason to not get significantly more efficient speakers. The more efficient, the more dynamics.

Next, you want to get as large a speaker as your living room can accommodate, to move the most amount of air at low power. This means 12-15" woofers in large boxes.

My cost no object speaker system is a pair of exemplar horns with karlson subs.

You could get a pair of those horns for around that price.

Agree with honeyooi. Harbeth 40.2 is incredibly good. 

My vote would be on the DeVore Fidelity Orangutan O/96 @$12k new. The great thing about these speakers is they come with their own stands & can be driven with even flea-powered SET’s. They are a Stereophile Class A (restricted) component. Imho these speakers may not even need subs as the reach down to 25Hz.

Used Monitor Audio.. I think you could get the platinums.

That is my vote. You are also in the range of B&W, Wilson's, Focal's and who knows what.

Oh, if you can swing a Sonus Faber Stradivari... :)

Best,

E

EgglestonWorks Andra II or III-  Full range, easy to place in the room,
very smooth response, very realistic sound.  very well constructed. Downside- 225lbs/each.