D2girls, I share your fondness for good horn systems and even aspire to build them, but don't have anything in that league. I assume you’re developing a short-list. Here are some possibilities that come to mind, in alphabetical order:
Classic Audio (field-coil motors, Beryllium diaphragms, big woofers, nice wooden horns. Their Hartsfield is the most butt-shakingly-fun speaker I have heard.)
JBL M2 (no introduction necessary)
JohnK, who posts on this forum, has some magnificent fully horn loaded systems.
PBN M2!5 (same horn as the JBL M2, same woofer, but two woofers instead of one.)
The Summa by Earl Geddes, latest version + multiple subs. Earl was my mentor. He’s pretty much retired but still makes Summas on a special-order basis.
Very best of luck on your Quest.
Duke