I am under the impression that with the Marantz you can access the FLAC files on a network or attach a USD storage drive to the USB 2.0 connection on the back. I am assuming it is similar to the Bryston BDP-2 (but with a built-in DAC). The Bryston system with a good DAC (like the Benchmark DAC2 or Bryston DAC) will be more $$ than the Marantz itself.
Another option is to investigate the XBOX One connected to a good DAC. Someone will likely write an app to do serve music from it (maybe JRiver writes an Xbox app). The Xbox is a computer after all.
Another option is to investigate the XBOX One connected to a good DAC. Someone will likely write an app to do serve music from it (maybe JRiver writes an Xbox app). The Xbox is a computer after all.