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

Focal 936

@inna   I agree that some of Eric's posts have not served him well.  He can be polarizing when pushed.  However, the couple of calls I made to him were very cordial and helpful.  It would be a shame to discount his speakers given that he has multiple models in your price range that I think would outperform the competition.  Also, his speakers work will with a wide range of electronics, tube and solid state.

My experience hearing Tekton was that they were exciting but bright and forward. I'd be more interested in these at your price point, listed on USAM:

Dynaudio Contour S 3.4
Paradigm Signature S8 v2 + C1 v2
GoldenEar Triton One speakers
Spatial Audio X3 Speakers
 ProAc 38R speakers
 Paradigm Prestige 95F Towers 

With hundreds of other loudspeaker choices why would anyone want to deal with Tekton? What are you trying to prove? 

Everyone will have their favorite speaker brand. Mine is Tannoy. There are frequently lots of tempting (to me) used Tannoys for sale.

I’ve used Tannoys with lots of VAC components for many years now. In the bigger system I have Canterbury GR with VAC Master monos & preamp. In the office I’ve used Glenair 10’s (I swap these in/out with Canterbury SE), with VAC Statement 450S amp. It’s quite a price disparity, but a great match. I got these Glenairs used from TMR several years ago for $2000. For $3500 you’re not quite to Kensington money, but maybe close-ish (SE). Turnberry SE should be in range (current line is GR; prior SE models are very good). Maybe you could swing modern Legacy Cheviots. Avoid the DC10A, which are frequently heavily discounted - great looking model but I don’t know WHAT the engineers did to that poor speaker (crossover)? There are older 90s / 2000s models which are exceptional for the money too - e.g. D700. And of course the many vintage options, which Tannoy is known for!

It’s either your sound, or not. The other speakers I’ve heard and liked (but not enough to change!) are much more expensive than 3500 even used: Magico S1, S5, Acora, Sopra 3, Von Schweikert VR55-Aktive, Audio Physic (forget the model but it was $14K+ and had a cone tweeter). I didn’t like Magico A3. Nor the really expensive Vons or Focals. The Magico S1, ueven Mk 1 used doesn’t quite get to 3500. Maybe some of the Audio Physics would get there.