I can highly recommend the Bryston BDA-1 in your price range. Used Bryston BDA-1s are currently going for $500-$700. This was a $2000 piece when it first came out some 10 years ago and is still capable of delivering quality sound. I had one in my main rig from 2014 until quite recently. I upgraded because its USB input was limited to 44K, but its coax, toslink and AES/EBU inputs are quite capable, but if you need higher resolution USB or support for DSD, you will need to look elsewhere.
