A good starting point is the Bluesound Node (499), or the Vault (1399).
the difference between the two are that the first you need a streaming service like Quboz, Tidal, or Amazon music or add your on storage. Adding storage isn’t particularly difficult but depending on your familiarity with IT, the Vault could be attractive since it has built in storage. High resolution music can be bought from HDtracks and Pro Studio Masters.
here are some links, and good like, it would be a nice addition your system, which looks very nice!
Bluesound products, Node and Vault:
https://www.bluesound.com/products/node/
https://www.bluesound.com/products/vault/
Streaming service:
https://www.qobuz.com/us-en/discover