Hmm...me, personally, I'd go with one of the following.
A GR-Research speaker kit built out for you or built yourself (N3s are amazing for a boxed speaker and the V2 kit is outstanding as well, I'm told).
A used Gedlee offering if they ever came up.
One of the Pi Speaker offerings.
Salk Songtowers.
Gedlee and Pi speakers are controlled directivity designs with good polar responses and high quality drivers. New Gedlee speakers would be over your budget, but they're some of the finest offerings on the market. Salk Songtowers are great options for traditional designs and provide a lot of value and excellent resale. I'd buy new as you can have them custom made for you and when you sell them, should fetch very close to what you paid.
If Gedlees weren't my current speakers (and I'd never heard them), I could be very happy with GR Research options. I've had several pairs of the N2X and loved them. I own a pair of OB7s still and like them a lot.