While it sounds like you are looking at traditional horn-based high efficiency systems (compression midrange and horn, plus other drivers for bass and tweeter), there are other approaches to similar kind of sound (very lively and engaging, particularly at lower volume), that are more budget friendly and great for someone who is handy at building gear. There are some quite decent full-range or wide-range drivers that can be used in multi-way and even single driver systems.
Until fairly recently, I have never heard single driver conventional dynamic speaker systems that did not have a few shortcoming that were show stoppers for me. But, I have now heard quite satisfying single driver systems. Some could be assembled as do it yourself speakers by someone who is good with wood working. I particularly like some of the 8" and 10" full range drivers in "quarter wave back-loaded horn" systems (look at Charney Audio for commercial system using that approach). While the tapered horn of the Charney might be hard to do, there are simplified versions that work quite well like the "tapered quarter wave tube" cabinet (also often described as "TQWT"). While some of the better 8" and 10" drivers are not that inexpensive as new drivers (e.g., AER, Voxativ, Cube Audio), there are cheaper alternatives out there (e.g., Tangband) that work quite well.
