Best used DAC around $500

Like the title says, does anyone have any recommendations for a DAC on the used market for around $500?

In my consideration list so far

California Audio Labs Alpha or Sigma DAC
Cambridge DAC Magic

Really open to any ideas, what im looking for is the most analog sound i can get from a DAC that is going to be fed digital streams from my Apple TV and my Pioneer ELITE BDP-05Fd

Thanks!