The new iFi Zen Stream at $399 is one option, though I’ve not tried it myself (won’t until it’s “Roon Ready”). Wired and WiFi network connection. USB and Optical output.
Project Stream Box S2 Ultra is another at $849, but USB-only out for your purposes. It’s essentially a Raspberry Pi internally, with a dedicated digital output section.
The Bryston BDP-Pi is a third, at $1,295, which also basically a Raspberry Pi with a HiFiBerry digital output board, in a fancy case with a display. USB, HDMI and S/PDIF COAX/Optical outputs. Wired-only network connection.
Pi2Design will be released something called “Mercury”, which is another Pi + digital output Hat as a ready-to-go streamer with all of the interesting outputs at some point soon-isn. Don’t know pricing. But combining their Pi2AES with an RPi4 yields excellent results)