For floor standers, Revel Studio 2 speakers or JBL Project Array 1400. Both can be had used for that price but may require patience to find. I’ve owned over 200 pairs of speakers over the last 50 years, from many, many manufacturers, and those are the best I’ve found in your desired price range. If you lean more to classic rock than jazz, I think you’d be better off with the Array 1400s.
For stand mount, listen to Dynaudio Heritage Specials. You’ll be astonished.