One of the first things I did when I got my Vault 2i was to plug it into my existing DAC. It was an improvement, but like we all often do. I upgraded the DAC. I enjoyed it for a while then I spent a little over $3k on my current DAC. It sounds phenomenal, best sounding source component I have ever owned.
I wasn't in the market really for a streamer, not at the moment. However I did a trade plus cash deal that let me jump into a brand new Aurender N200 for only $750 out of pocket. It's a great machine. Sounds excellent with my DAC and driving my headphone DAC also with it's dual outputs. Easy to add songs via PC , build quality is over the top... built like a tank. I love it and it's good enough to pair with an even better DAC down the road