Dave, I’m seriously considering going w horns.
One can go in a couple of different directions.
Full range horns where mids/treble horns sit on Klipshorn-like basshorns, the whole thing being powered by a single set of tubes, or biamping w tubes (assuming the basshorns are of similar high efficiency to the mids/treble horns).
Examples include Haigner Alpha- and Gamma-Horns.
Or horns where the mids/treble horns are powered by tubes, but the bass (Basshorns or dynamic cones) are powered by SS, usually Class D (due to bass section being of much less sensitivity).
Examples include AGs, Cessaros, Sadurnis.
I’m assuming you only have time for the first category.