Digital streaming options for my system are confusing

Another Vote for Bluesound.  It sounds great in a high end system, I wouldn’t let old fashioned High End Dealer snobbery persuade you otherwise.
  May I ask the OP—how many 32 bit recordings do you own?

Or you could use the Internal DAC in the Node2i for MQA and the current DAC for everything else.
If possible, I would use a wired connection.  I had some issues with WiFi and Bluesound and the Ethernet works much better, but the Node 2i is supposed to have enhanced WiFi capability, so hopefully non important...

OP, at the risk of being redundant, I just don’t believe that once a certain price point has been reached, that there is much of a difference between streamers when they are inputted into the same DAC.  The improvement obtained going from a $500 Node2 to a $5000 will not be a factor of 10, more like a 2%....it is asymptotic.  My suggestion is to start with the Node2 and compare it’s DAC vs the DAC of your McIntosh.  After a while if you get upgradeitis, my next move would getting a killer DAC, that will enhance all of your digital sources.  After all that, if still not fully satisfied, buy a higher end streamer