Check out the Lumin U2 mini. No DAC and Roon ready. Lumin also has their own software that may be used instead of Roon. The mini uses Lumin’s latest chip and software that may be updated. This streamer is a solid performer for $2400. The Lumin U2 cost $5K. However, the difference in sound isn’t worth twice the price IMO. The Bricasti M3 is another solid performer worth consideration. 

I use a Volumio Rivo with Superfarad 3 linear power supply. Sounds excellent.

Used Aurender N100H. They are $900-1200. The Listening Room typically have several for sale, and one can buy confidently from them.

Sonore opticalrendu. I've had this for a number of years. Sounds great.

https://www.sonore.us/opticalRendu.html

Innuos was on my shortlist when I was in the market for a streamer without a DAC, However, in the end I purchased an Esoteric with a DAC. Unless your DAC is something really special, I’d suggest purchasing one with a DAC, that is also special.