You can connect the hard drive directly to Oppo 205 USB3 ports (behind), then use Oppo Media Control app to select and play music files. This method means you don't have to spend at all.
Oppo 205 DAC is very good. If you want to play music files up to the maximum rates supported by Oppo 205 DAC (PCM 768k, DSD 512), consider buying/building a streamer without built-in DAC; then connect the streamer to Oppo 205 using a good USB cable.
Oppo 205 DAC is very good. If you want to play music files up to the maximum rates supported by Oppo 205 DAC (PCM 768k, DSD 512), consider buying/building a streamer without built-in DAC; then connect the streamer to Oppo 205 using a good USB cable.