Firstnot, honestly I'd just give the 205 a try. You have it already and it really is all you need to get started. Get a free trial of Roon (you can find 14 day/30 day free trial codes if you look around). You can then use an existing Mac or PC as your Roon Core (if you have an iTunes library etc on that PC then Roon will tap into that). Provided your PC (Roon Core) and your UDP-205 are on the same network it will show up as a Roon endpoint and you can use your PC or the Roon app on your phone or a tablet to control your music. You can buy standalone Roon Cores, Roon Nucleus, and store music on that but you can use what you have for now and see if you like it. If you have a PC, a 205 and a Tidal account it won't cost you a penny to try it and I am betting you will be as happy with it as other Roon users are.
Good luck and report back. Interested to learn what you think!
Good luck and report back. Interested to learn what you think!