Suggestions for $2k budget

I recently saw new Martin Logan 60XTi's in that price range.  I really liked them in a store demo, but I think a new model is coming.
But then I got some used KEF R700's for a bit less.  I really like the sound and imaging of these.  I believe the ML's played lower better.Both of the above will sound good without a sub. Stand mounts will want a sub, which needs crossover management, which is newer gear...
Lots of good choices out there!

Elac Navis Powered speakers. Then unload the Adcom- not up to snuff
anymore- and consider the source/preamp need.

Buy nothing without a trial period.

+1 on the vandersteens. For 1800 you can get a pair of 3a sigs. 

I like the sound of Sonus Faber - Venere 3.0 or and 3 way you can get used. 
And each person will have an opinion yet inly your ears matter. 
I’d encourage you to visit a good hi fi shop and see if they have used speakers for sale. And $500 set of speakers today are pretty good. I still miss my Mirage 460s from college. 

If I was you I'd try the Buchardt S400s at home for a month. I'd doubt you'd ship them back but you could if you find something else you like.