I do not listen through headphones so this may be advise that may not help you. IMO the source is critical to hearing what a system can do. The DAC that I build reproduces music that most people have never heard before in that the separation and tone of instruments really comes through like I have never heard before. It does not matter what the other components are, the DAC changes the sound in everyway. Same goes for my phono stage and preamp. I know some of the DACs mentioned above and they cannot reproduce music the same way.
Happy Listening.
Happy Listening.