UPDATE:
Chromecast Audio arrived earlier today, got it connected to the HD-DAC1 with an Optical cable and set up. Streaming from Spotify Web is all set, boy some distinct sound differences from album to album with Spotify, I should take note of the transfer rate on the DAC and see how much it varies, I know their files are kind of all over the place. But the good ones are really nice, very pleased.
For local files we're going to use Plex, would be nice if you could incorporate Spotify to Plex, but it looks like they have an agreement with Tidal. So we're waiting for the locals to sync and we'll give them a go.
If I'm missing any tips or tricks that would be helpful, please toss them out