In my mind, high-end is dCS, Emm labs, Empirical Audio, Light Harmonic DaVinci, Aqui HiFi, Resonessence, TotalDAC, Chord etc., but your Bryston is a solid affordable choice. They are good people.
If you want good SQ from your Oppo as a transport, avoid HDMI. Use S/PDIF, AES/EBU or I2S. Get a good cable.
And reduce the jitter of that Oppo first:
http://www.audiocircle.com/index.php?topic=154408.0
This will make CD playback a LOT better.
Here different coax cables are compared:
http://www.audiocircle.com/index.php?topic=154425.0
Jitter is ALL that matters with an external digital interface. More important than DSD.
Steve N.
Empirical Audio