Streamers under $1500

This looks very good. Streamer w/ DSC and upgraded PSU. Try Qobuz. 

I am fully on board with Wiim Pro if it includes a USB port for local music. I know many users have requested this feature from Wiim, but so far they have only implemented it on the Wiim Amp. I hope it is on the road map for next version of Wiim Pro. I bought it anyway just to try it out. It does sound as well as ifi zs.

If my memory serves correctly, the WFS mod bypasses the Sonos DAC, right?  Sobwhat DAC are you using?

Get a BlueSound Node and a decent interconnect, listen to it for awhile, then add on a LPS, power cord, and maybe even the internal upgrades. You'll start with a very good unit, and finish with a great custom unit, all within your budget and (until you mod the innards) a warranty, and a strong 'ecosystem' to support you. 

I went through various stuff under 1000 and settled on Raspberry pi w Allo digione card or equivalent. And their LPS or Nirvana power supply.  Add an SSD for files. I use Volumio with it but there might be better. Small footprint, and I think sounds better than BlueSound which I also kept, and a lot of these all-in-one boxes. But the first reply about software you can live with is important. Not just sorting and other features but how quick does it respond with server unit from whatever remote device you use.