As always I think amp-speaker matching should start with finding a speaker that locks in well with your room.
But if you want enjoy 2A3, 300B, and 845 SETs the Heretic line of speakers made in Montreal are guaranteed to work.
And, of course, I've been using LS3/5a with SET 300Bs for 35 years.
So those are two non-horn recommendations.
enjoy the adventure
herb