Why not buy a subscription to Tidal and stream lossless through your Oppo? You already have everything you need to get started except the Tidal subscription. Then as you get the urge you can upgrade the streamer, DAC, etc. til your heart's content :-}
Where/how to start?
My music source is CD, SACD, and LPs. I occasionally listen to streaming music through Spotify. I don't have a music server or I don't use DACs for any digital forms of music.
However, as I am growing older (almost 60), I've been thinking about making things simple and setting up digital systems. Also, even though it is not lossless, I feel that music from Spotify is getting better recently.
I have a dedicated HT and 2 channel system. I have OPPO 105D and Esoteric UZ1. (Also 5 turntables.)
So, how would I start? I don't have a budget set yet so it would be tough for you to give any concrete advice, but I'd like to hear about basic and simple pathways to setup a decent digital systems.