I have 5As powered by Ayre and it's a very good match. That said, Richard V typically demos his speakers with ARC electronics, so that might be something to keep in mind. And, although I have only heard them briefly, the Vandersteen amps are impressive, and they were designed to match with your speakers. My local dealer, who sells all three brands, says he likes the Vandy amps better on Vandy speakers than either ARC or D'Agostino.
Whatever you choose to do, happy listening!