As per your last post, you can start off with Node 2 and use existing DAC in SPL. Many online vendors offers Node 2 ($550) with 30 days return policy. The Node 2 also comes with an internal DAC so you will have an flexibility to compare the two DAC’s. You would need a SPDIF cable to use DAC inside SPL. DH Labs sells an inexpensive high quality SPDIF cable.
If you find sound quality of DAC’s on hand undesirable then you can look into adding a dedicated external DAC’s within your price range. Many folks here use an external DAC with Node 2. The Node 2 is a good entry level streamer with a very nice app. The app allows access to most streaming services than any other streamer I am aware of.
If you want DAC/Streamer in one box, look into offerings from Lumin and Aurender.
Good luck!