Horn Speaker Recommendations

 But sadly with horns, the audiophile market isn’t offering many worthy of purchase unless you want a hybrid horn and honestly if I had to go that route I would buy a conventional dynamic

interesting. What are the problems with Hybrid system like JBL 4429/4430/4367.
what are the advantage a full ragne horn system?

1) JBL DD 67000 New $85K Used about $30K
2) JBL 4367(I own) New $15K Used about $9K
3) Klipsch Klipschhorns

Great old American speakers. There is NO substitution for 15" woofers! 

I’d be looking at vintage Altec over Klipsch. 
I’ve owned all of them and the best are the 500 cycle horn (511) systems like the Heathkit designed Legato
and Altec Laguna or A-7 ( Magnificent) Maybe harder to source than Klipsch.  Better yet, get the parts and build your own mock up to suit you and your room. Research the different LF systems. 
2-15’s sealed, 1 15 in A-7 horn, Onken. 
Not as hard as you’d think. 

I listened to these yesterday at Listen UP Denver:https://www.avantgarde-acoustic.de/en/products/duo-series/duo-xd.htmlThey list for $45k, they were offered to me by Scott Gennaw at $30k. They have been on the showroom floor for about year so I don't know if they are the very latest model.
Impressive, but not for me. Tell Scott that Cliff sent you.

I have just finished reviewing the new Klipsch La Scala AL5 at :https://hifiwigwam.com/forum/topic/134937-klipsch-la-scala-al5/
for a British view of the speakers.