Your Oppo can be used as a streamer using the Network Tab. I would start there, since you already own it. It isn’t the most elegant streamer, but it gets the job done. What it doesn’t do is Internet Radio or Tidal/Qobuz, the two streaming services that do CD quality or better. The 205 has a very good DAC so you don’t need to buy a new one
You need a HD to connect to the Oppo. Something like a 1TB Western Electric Drive can be directly connected via the Oppo usb input so you don’t have to worry about WiFi vs Ethernet. Alternatively you could connect a laptop and use the HD of the laptop and use the laptop for streaming sources and internet radio.
You will need to convert your CDs to whatever HD you choose, and that is a whole different topic
You need a HD to connect to the Oppo. Something like a 1TB Western Electric Drive can be directly connected via the Oppo usb input so you don’t have to worry about WiFi vs Ethernet. Alternatively you could connect a laptop and use the HD of the laptop and use the laptop for streaming sources and internet radio.
You will need to convert your CDs to whatever HD you choose, and that is a whole different topic