@andrewkelley
Have you compared the Simaudio Moon 280D with any good 1.5k DAC?
I believe a good dedicated DAC with a good source should sound better. If not, the Simaudio Moon 280D is a giant killer as, for the price, its a streamer and a DAC.
If not, may be you should think about upgrading your main system with a better streamer + DAC and keep the Simaudio Moon 280D in your second system. It would cost a little more, but you could get better sound in your main system, as I guess could be better. Of course, you would have to change the Bluesound Note for a better sounding bridge like the SOtM SMS-200 Ultra Neo or the cheaper Sonore Ultrarendu.
I prefered my SOtM SMS-200 Ultra Neo + Gustard U16 USB Converter + Audio-gd R8 Ladder DAC combo (about 3.5k total) against a +20k Mark Levinson streamer and DAC and also vs a +20K T+A DAC.
Just an opinion.