Digital streaming options for my system are confusing

Another vote for Node 2. The newest version is the Node2i. If you get a Bluesound and stream Tidal and the MQA albums, you might be surprised at the quality of sound. Auralic, Lumin and Innuous have some high quality offerings but I have found NAD and Bluesound are really dedicated to customer support. To me customer support often gets overlooked when choosing brands. Some companies and dealers promise the world when you pay top dollar for the gear, but fall short with delivering service. I have had stellar IT support for networking issues with the modestly priced Node 2.

Something worth mentioning if you are going with the Bluesound ecosystem. The Vault is a better option if you want to digitize a CD collection AND stream music. When I bought the Node 2 I had many CDs ripped with ITunes which created file folders and album artwork (metadata) that Bluesound would not see. I had to place artwork into many of those album file folders and properly label the artwork. https://support1.bluesound.com/hc/en-us/articles/200271926-Why-is-some-of-my-Album-Cover-Art-shown-a...

The OP has many choices at many price points, that is always a good thing. One person mentioned using a Mac mini as a simple solution. I am not knocking any audio setup, but I think it ironic because I moved away from a computer (multi-functional device) because I wanted a device designed, engineered and built as a music server for audio. All the music servers mentioned have great audio, so it may just be your price point. Again I picked Bluesound for the good engineering and customer service at a good price. It fits my needs, I am not one to spend thousands of dollars on a music server. If I wanted to upgrade the DAC, I can do so by adding a much better one like the Ayre Codex.

Audiotroy- yeah that is good advice. Also, tricky how you offer great advice on the forum and can slide in a sales pitch for business. Arrogant, but I am sure you get a bite from time to time. Maybe you could pitch your customer service and terms and conditions as well.