Just a second for the GoldenEar Technology line. In addition to the Aons, check out the floor standers such as the Triton 7 or Triton 5 - should be well within your budget used or demo. They're very easy to drive but sound like much more expensive speakers.
BTW, I have the PM8004, predecessor of the 8005, and it's a great amp. I generally feel you should match your amp to your speaker, not the other way around.
BTW, I have the PM8004, predecessor of the 8005, and it's a great amp. I generally feel you should match your amp to your speaker, not the other way around.