I'm sorry I can't help with amp advice, but since your Mozarts are new, just thought I'd pass this along. A few years ago, on (I think) the Audio Asylum forum, a Vienna rep said that to achieve intended performance, the Mozarts MUST be filled with sand. He said listening to them without the sand filling is not listening to the speaker as it was designed to be heard. Just FWIW. Hope you enjoy them!
-Bob
-Bob