The EAR suggestion above is a good one. I have traded for them in past and have always been impressed with their overall sound.
As another option, you could always look for a DAC with variable outputs and just use your ARC as a transport. You could probably find a used Bel Canto DAC 3.5 with the VBS1 in that price range.
As another option, you could always look for a DAC with variable outputs and just use your ARC as a transport. You could probably find a used Bel Canto DAC 3.5 with the VBS1 in that price range.