Andrew
If Im not mistaken, you have a Sim Audio Streamer and DAC all in one, a Bluesound Node streamer and a Schiit Gungnir DAC, am I correct?
If so, can you stream with the Bluesound to the Sim Audio, using the latter only as a DAC? If you can, that would give you the chance to compare the Sim Audio as a streamer vs the Bluesound and as DAC vs the Gungnir. It would help to look for the weakest link of the chain and to see if the Sim Audio is as good as you think.
On the other hand, Hans Beekhuyzen has a YouTube channel and he has tried the original SOtM SMS-200, then the Ultra and Ultra Neo versions. He also has reviewed A LOT of others streamers/bridges, to mention a few: the Node, the Auralic aries mini, the Rasberry Pie, etc.
He answers questions vía YouTube, on the coments side of every video. He is very profesional and I guess you could ask him wich streamer/bridges he recomends considering your budget and needs.
Dont forget that many of the products we have mentioned here are bridges, meaning you will need a computer to run them. They will send the signal to the DAC, but you have to control them with a computer using Roon, Audinirvana, or another software.