One speaker that you might explore is the Pure Audio Project Trio. It has a pretty dominating appearance, is open baffle, can be set up with a variety of midrange drivers, upgrades, etc. Apparently very efficient though may be a little bass shy. Since they apparently sell direct, you either need to find someone in your area who already has them, or pay the tariff for home trial (they actually have it set up for you to "rent" them initially- I don't know if they will apply that toward purchase).
I understand your dilemma and you could easily discount what I offered above for two reasons: I've never heard them, but was intrigued (though they have a bit of an IKEA vibe, apparently have satisfied customers) and I am an Avantgarde owner (Duos) who has considered going to a vintage horn system (now put off since I've started to get back into motorsports after a 20 year hiatus). The Duos were almost impossible to get "right" until I: added big subs and DSP'd them, recalibrated the integrated woofer so it seamlessly mates with the horns (that's the tough part of these, aside from the price of newer models which is considerable) and made a serious change in phono cartridges to give me the bass dimensionality and texture I felt was lacking. As one boutique manufacturer said, "well, you have a lot of expensive equipment." Yeah, but that's not the goal.
I was a stat listener for decades. I started with the Quad Loudspeaker in 1974 and still have my original pair, refurbished, in a vintage system. I also had Crosby Quads which were, overall, a better speaker, but lacked the midrange magic of the original Quad, despite its severe limitations. And I gave up a long time ago trying to mate subs (and ribbon tweets) with the '57.
When I switched to the AG Duo, it only really started to make magic with an SET amp but even then, bass was limited or discontinuous, depending on where the integrated woofer (not really a subwoofer) was dialed.
I throw the first paragraph out at you as an under the radar possibility. They are somewhat over your budget new. And I have no idea what the availability of used pairs is, let alone shipping costs.