I have a streamer that is not well known but which I believe is a great value for a little over 1000 new. The Metrum Acoustics ambre streamer. It is only a streamer and has to be connected via ethernet. From what I know it is a pi based streamer with upgraded clocks, linear power supply and better parts in one unit. It has digital outputs for usb, rca, aes/ebu and an optional I2s board can be purchased. the I2s board is really only compatible with a few DACs including Metrum which I own.
I've tried both Roon and Volumio as the software and prefer the sound of Volumio so that's what I use for Tidal and Qobuz listening.