A used Benchmark DAC1 HDR would fit in the ~$600 budget and has XLR out. I've had mine for about 10 years, use it as a DAC and preamp and have no complaints.
Best used DAC under $750.
I am currently using the DAC section of my Mac 2500. Would like to have a separate. Also would like xlr outs. Not looking to buy new or spend more than $500-$750. I appreciate your recommendations from your experience. I have owned several separates in the past. Antelope Gold, Wadia 121, AMR 777, April Music ??