Looking for a warm sweet speaker

mckinneymike .....The Sonus faber Olympica 3 would fit the bill. It does most things right and the treble region [soft dome] is very detailed..but.. at the same time..non-fatiguing. Bass is very articulate and fast..and can go low,but, not sub low. Mid-range splendor that will make you want to listen all night long. With the right set-up and recordings,it can also throw a soundscape second to none. They are also in your price range used. Good luck with the search...

Another vote for Vandersteen

There's a nice pair of Harbeth M-40.1's under your budget listed on Audio Mart and located in Michigan.  This is my desert island speaker.  Very easy to drive, full bodied, warm, yet detailed.

https://www.usaudiomart.com/details/649442789-harbeth-401-loudspeakers-in-natural-cherry-with-stands...

I nominate the Sonus Faber Guarneri Homage. 

The Swiss brand Boenicke are a speaker worth checking out if they are available in your area. They have this unique balance of naturalness and warmth whilst losing nothing in detail. Extraordinary speakers. The Boenicke/CAD room in Munich was one of the best sounding to my ears.

What I have heard of some Proac speakers also seem to fit your criteria. The models with the ribbon tweeter sound gorgeous.

Of the US brands I have heard the Avalon Ideal might work, it sounded terrific when I demoed it, and I felt had a more British sound for an American speaker. In Munich the Joseph speakers sounded very good too and seem to have a sound along the lines you describe, though the source in that room was a lovely reel to reel which would have helped.