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

Ha… I just spent that this week (but CDN not USD) on a used pair of speakers. Probably not your cup of tea though… Coincident Total Victory but I have desired these for a long time, saw an opportunity and decided I should just indulge. Good Luck with your quest…

As I mentioned, there is no rush at all. In fact, if I could find Michael Green Audio's top Chameleon speakers, that would be great. They are impossible to find.

Besides, I usually start threads not only for myself to get advice and suggestions, I try to initiate interesting and helpful discussion on a variety of audiophile subjects.

But no one so far describes the sound of their recommended speakers.

Well, indirectly I think I did when you mentioned what you were looking for.  But to be more direct, the Tekton line is noted for a very smooth, detailed midrange that draws you into the music.  Contrary to one comment, these speakers are not bright.  I am intolerant of bright/forward speakers and I can listen all day to my Double Impacts without any fatigue.  Bass extension is quite flat to 30 Hz.  Powerful, taught, extended.  Last, but not least, the imaging is precise with a large, realistic sound stage that exceeds the Magnepans I had prior to the DI's. 

Revel F208 are nice nearly full range speakers and reasonably sensitive.

Might want to look at Vandersteen Model 3A’s.

Knew they’re about $7,190. You may find more recent used, for maybe half that or less. 
Best of luck to you!