Thanks all.
My wife has a pair of Isis. They're good, but a VERY different speaker. They're wide open sounding, but don't come close to eye sumptuous Eden midrange, nor do they go nearly as low. The two don't sound like they're from the same family.
I haven't listened to the SF Lumina, but have to the Sorrento and they didn't do much for me. The only ones anywhere close to my price range were the Minema Avetor, and boy, do they have some midrange magic. Real, tactile, and soundstage like crazy.
And in terms of rebuilding the drivers, I'd think that it would change the character of the speaker. I'd put money into it (I wouldn't do it myself) only to possibly not be thrilled with eye result. The woofers were Castle's own in-house.
Not a fan of the KEFs. I've heard them. For me they're quick and open, but not possessing of a particularly expressive or gorgeous midrange. In a way, they sound like the Castle Isisb model.
I'm hoping to get a hold of the current Reynaud US importer and see if I can arrange to get a hold of a pair of current Reynauds to hear. I'm also wondering what the Cantabile Jubilé brings to the table compared to the Bliss Jubilé, and whether that would work in a relatively small room (12'x12'x11').