Streamers under $1500

Not interested. It won't play USB.

I listen to files much more than Qobuz.

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.