Audio Research 100.2. Owned one and it is a great amp. I know the Aragon amps well and Monitor Audio speakers. Not saying the Aragon aren't nice amps; worked at a shop years ago that sold them. For your budget and the speakers you have, I think you can do better. Parasound A23 or a used A21 would be a great amp as well and I have heard both on Monitor Audio's. The 100.2 is a killer amp and I probably should have kept mine.