I think that I am finally at a stopping point with my B&W Signature 800's. They do everything that I want them to do. After a certain point, there are no earthshattering changes. I had N801's before that, many Klipsch horn speakers before that and started with JBL's in the 1980's.
The Klipschorns were a lot of fun because they are very hands on if you prefer, meaning that I built crossovers, then used a digital active crossover with tri-amps, etc. I still have a bunch of parts to put together a three way horn system and may complete it some day.
In any event, additional changes really are not worth it at this time and the horn project will just be a fun project.