if you're going this route you might want to look into HLCD's i've got a set, same premise but you get a better efficiency (109db vs 93db) and instead of the 700hz cut off, the horns will play down to 400hz. They can be a bit bright (playing Coltrane mostly) but a little eq work and you're done.
i dont mess with horns. I don't have enough knowledge on them to get the tuning just right.
as far as ribbon sound, they have their own distinct sound, yes. you either love it or hate it simple.