$3500 floor standing speakers used. What would be your choice ?

Here's maybe a fly in the ointment - https://ohmspeaker.com/

I have a pair of Ohm Walsh Tall 3000s in my factory loft living room listening area. My now favorite speaker, they being omni directional. Great that I only need to get them about a foot away from the brick wall, 11' ceilings, 17' X 30' factory loft setting. And the sweet spot is very wide, tall.  Started years ago with Thiel CS series, then to ELACS, KEFs - all good. But Ohm Walsh series really shines.  And in your budget range for sure you can get a pair of Walsh Talls that fit your listening room. If I knew how to post a .jpeg of my setup I would. Oh, almost exclusively PS Audio high-high end pieces. Even heard PSA's Paul McGowan, on a couple of his daily podcasts, compliment the Ohm engineering having know Ohm's original creator/engineer (just recently RIP). 

Upscale Audio currently has Tannoy on sale, some are "seconds" that might have undetectable scratches in places you'd likely not see. Apparently, Kevin got in a bunch of Tannoy last year that needed rework and got so mad about it, that he has switched to Fyne Audio and is closing out his existing stock of Tannoy (which other than cosmetic imperfections have no issues). At least that was the drift I caught from his postings. So anyway, you might want to check his prices. You might get "new" for not much more than used. 

@inna with the risk of sounding self-serving, but you might find this interesting, I have a pair of GoldenEar One.R speakers in like-new condition for sale.

Wonderful speakers with built-in active subwoofers (*) and DSP. I’m sure you can find a lot of reviews online.

(*) this would also take a lot of load off your tube amp

MSRP is $7500 and I’m selling them for $3200, plus if any shipping.

I am based in Raleigh, NC but can ship. I have all original boxes and accessories.

Just shoot me a direct message if this is something you’re interested in learning more about.

All of your problems are solved...I know just the speakers that you need and they are in my spare bedroom packed away. I'm taking about a pair of Paradigm Prestige 85fs, gorgeous piano black finish, very gently used and not a single flaw or imperfection anywhere. They are begging to go to a new home...

@mulveling - I am genuinely curious about your post concerning phase errors in multi-driver speakers. I was reading Floyd Toole's book on Sound reproduction and he makes a point in that book that phase errors in normal full range systems are not usually bad enough that it has a noticeable impact on the sound quality. Since you say you can hear phase errors, can you describe what to listen for? I may have noticed it in my listening but didn't realize what it was or what to call it. Please explain so I can benefit from your observations as I audition new speakers for my home that's being rebuilt post-fire.