I had a Node 2i and upgraded to a Lumin U1 Mini and thought it worthwhile. There was an improvement for sure, especially in imaging and sense of air. More subtle than a DAC upgrade though. The OP already has an excellent DAC, A streamer upgrade will allow him to utilize it’s full potential.
One consideration is how the streamer will access ripped or purchased music files so worth looking into the particulars of that with respect to any given streamer.
The OP wants wireless. The Lumin must have wired ethernet. I did not have easy access to wired ethernet where I have my Lumin but used an TP Powerline extender. This solution works flawlessly and is what a prominent retailer recommends.