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

I have Maggie 1.7's actively crossed over to subs. HUGE difference getting the lows out of the Maggies. At $3500 you should be able to get the Maggie 3.7's with a full ribbon tweeter and a quality active crossover. After that you can add a pair of subs when funds accumulate. Rolling everything off at 60Hz with the 18db slope is nice however found 60Hz roll off on the low end at 18db/octave then the high end is set at 70Hz and 12db/octave

Maggies are notorious for soaking up power - op's tube amp is doing 60 Watts / ch on a good day (fairly optimistic for a push-pull pair of EL34).

No panel speakers, please, not my kind of sound. Well, except maybe top SoundLabs.

No horns either, again, not for me.

The best speaker I know of near your price range would be the used set of Silverline Bolero speakers for sale in CA. They are fantastic sounding speakers that play full range and beautifully check off the sonic boxes important to you. I think the seller is asking $4400, but perhaps you can get closer.

They may not be close to you and perhaps just out of your price range? I do know they are immensely musical with fully fleshed out mids and excellent bass foundation. Easy to drive and very nice looking! Nice big stage with very good imaging and easy to listen to for many hours