The Opus 21 is a very mice CDP with volume control but it requires a good power cord. The Wadia 861 was a better sounding unit with the stock power cord. The Shanling was just OK compared to these units. I also had a completely modified Shanling and it was not as good as using a few of the $2000 list price DACs. My suggestion is to try an APL or Modwright modified CDP that someone else invested in and is letting it go cheap. You can always resell. I have found that the modifed units can really up the sonics of your system over most stock CDPs that I have heard.
Happy Listening.
Happy Listening.