In that price range new and used you have a lot of choices in vanishing speakers. I was lucky enough to find a pristine pair of Maggie 3.7, sent them back to Magnepan for a total refresh and they emerged as the lastest model the 3.7i all for less than $4K.
Just be aware that the more transparent a speaker is the more it will reveal the shortfalls in your sources and supporting equipment.
Just be aware that the more transparent a speaker is the more it will reveal the shortfalls in your sources and supporting equipment.