I have a Bluesound Node and Vault. I think the Vault idea would make sense if you have a library of CDs you want to rip into the Vault or you have an existing library of music on a HDD that you want to move/transfer onto the Vault HDD. If you don’t want storage of music then another combination of DAC and streamer might work better. You will get many suggestions here. For me I have used the Bluesound ecosystem with a separate DAC with fine results but people here on audiogon may suggest options other than Bluesound.
You may want to clarify how you will be listening to music...