First any Levinson, they sound GREAT with B&W. Very smooth in the highs, which mates well with B&W, great mids and very good bass. Followed by Pass same reasons as ML, and Bryston. Krell is another good choice. Stay away from tubes. B&W Nautilus speakers have beautiful mids and the bass needs SS. The highs are strong and accurate (some people hear this as bright) with the right cables and room placement they are inviting. Peace and Good Listening, Pat.