I'd recommend looking into the Lumin T2. MSRP is $4500 but a used or maybe demo unit is definitely inside your budget. I also think you will appreciate its excellent sound quality given the critical demands of classical and jazz.
It will stream music from your local NAS, works with Roon as well as other UPnP control software, and supports for DSD via its ESS DAC chips.
It will stream music from your local NAS, works with Roon as well as other UPnP control software, and supports for DSD via its ESS DAC chips.