Hi,
I've had quite a bit of kit through the years, and I'm currently in disbelief of my current system: Cardersound Tybone Vs. 1 (Saburo cabinet with Planet10 EnAbled Fostex FE126E drivers), Cardersound Morgan, and the latest Miniwatt amp (N3). Due to the nature of a single driver covering everything, and the Morgan covering 85hz and below, low level listening is the best I've ever had. Any speaker with a crossover will have a sweet spot where the sound comes together. With the Tybone/Saburo, the sound is complete and organic from a whisper to very loud in my 8' X 14' X 9' room.
I've had horn systems that do loud better than any box/cone speaker, but I've never enjoyed low-level listening through them. I have a little over $1,600 invested in amp and speakers, and it is the most involving system I have had. Doesn't matter what type of music, if there is emotion and nuance involved, this system lays it out. When I want to get loud (Green Day - American Idiot), the drums are in the room, and the soundscape is huge.
There had been a pair of homemade Saburos on Audigon a few weeks back - it's a great secret and nobody had scooped them up ($365?). If music is what you chase, try a great single driver and cabinet...
I have another Agon buddy who is quite enamored with his Omega speakers, and I have spent some great times with Ed's Hornshoppe Horns. I think all of these speakers need bass augmentation to be full-range systems.
Good Listening!