I have not listened to the ML Vista's, but came within inches of buying a pair of NOS Summit X's from a dealer. I had heard the Expressions, which replaced the Summit X's and then listened to the Summit X's-- big mistake. Martin Logan has not, and cannot, get the bass depth and timing right on these speakers. Listening to a piano concerto, it was among the best sound I had ever heard-- from any speaker. Put on something with a set of drums in it, or a bass guitar, and it goes right down the drain. I walked away from a brand new set of Summit X's at $5,400 for the pair just for this reason. The Neolith's, with their huge size (and more than $50,000 price), may have solved the bass problem. But you didn't ask about spending $50,000 in your post. Trust your ears :)
Martin Logan speakers
Are Martin Logan speakers still considered to be high quality speakers? (I have an opportunity to buy a used pair of Vistas) I have an old Audio Research VT130 amplifier. Would it be a good fit with the Martin Logans? If not, what would be better, but not outrageously expensive?