In that price range, the best DAC I’ve auditioned is the Teac UD-701N - fantastic open sound, lovely build quality and built-in streamer. It also works well with HQPlayer, if you want to go down that route. (It uses the same main board as the $15k Esoteric).
On the source side, I remain very happy with using a Mac Mini as Roon server. I’ve done custom PC builds, and listened to multiple intermediate streamers, but haven’t found anything that makes a significant difference to the sound, in what is a very revealing system.