Musicslug -GOOD QUESTION!
The Sophias are broken in. They were purchased and set up by an authorized dealer as a "demo" pair.
My dealer is pushing VTL MB450 SII and VTL 6.5 pre, but at $26.5k, plus CA taxes, I don't see the value. The MB450s at $15k is a little spendy, but it may be one of the best options.
Audphile1,
Thinking outside the box are you? Swaping the preamp could be a good idea, I'll borrow my dealers VTL 6.5 and see where it takes me with the Ayre amp.
Plinius:
I have a Plinius 9200 integrated which does okay with the Sophias and sounds more magical than the Ayre, but lacks control, impact and transparency. A bigger Plinius could be the ticket since I've got Plinius as a source?
Not enough experience with the other brands mentioned, but great ideas everyone...