Dave, I'm sure by now you're up and running with your Mac Mini, but I wanted to pass along that I have been extremely happy with my Mac Mini that I had modified by Benjamin Zwickel at Mojo Audio. I purchased a Mojo Audio Watt, external linear power supply, and a Mojo Mystique v2 NOS DAC. My music is stored on a Synology NAS and I play it through JRiver's Media Center. As I said, I have been totally pleased with the set-up.
https://www.mojo-audio.com/mac-mini-upgrades/
https://www.mojo-audio.com/mac-mini-upgrades/