I would recommend Rotel or Bryston. I have heard both and they were an excellent match!
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I had the DM603 S2 many years ago (my first and by by far most exciting hi-fi purchase). I found that a polite sounding amplifier such as Arcam will suit the somewhat bright aluminum dome tweeters. I used a Bryston 3B-ST which provided excellent dynamics and bass, but could be a little fatiguing with certain recordings.