Montana EPS or Dunlavy 4A's?

The only speakers on your list that are time-aligned are the Dunlavy 4A's.

I think the Dunlavy is a tremendous speaker, but it can be a difficult one to setup in a typical room. It needs to be widely spaced (along the long wall). Setup this way it has a narrow sweet spot. The Vandersteen is also a great speaker. It's also somewhat easier than the Dunlavy to setup and get great real room results. A well setup system in a good room using $3,000 to $4,000 will frequently sound better than systems using any of the speakers you're considering. I don't think you can go wrong with any of the speakers you mention, but it will take dedication on your part to maximize their performance.

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The Montana EPS is the one. Among other reasons, the Montana uses ports and the Dunlavy does not. Porting (when done right) allows a much deeper bass. The Montana EPS uses the Revelator tweeter. I think it is the best tweeter on the planet. The Montana's are seemless and as transparant as electrostats with killer dynamics. Then there is the cabinetry....no comparasion. EPS is the way to go.

Both are great speakers but I thought the 4A's had a tighter bass and less Fatigueing . I bought the Dunlavy V's which have the deepest tightest bass I have Ever heard. Also you may want to check out VMPS speakers and the Osborne Epitome's.