When I bought my Jubilee's (almost $8,000 total for them and the active crossover) I happened to own a pair of Khorns already that I sold for 'about' $3,000 which meant I could buy the new speakers for 'about' $5,000 out of pocket.
Sell your speakers and now, the net expense for the new ones are perhaps easier to swallow. (I would also think that you could get them at a discount from the MSRP)
Not having heard them, I have to think that horn is what is going to make them special.
(not selling the Jubilee's though....I'll stay where I am, tyvm!)