I also recommend to audition a well made Tube DAC design I think one can be surprises by naturalness and a clean detailed sound. I personally hared quite a few Op-Amps DACs and to me Tube DACs where sounding more open almost 3D sounds that hangs in the air. Of course all there audio components in a musical chain needs to support and maintain the clarity of the sound, but to have a good DAC is definitely worth it. Once you experience that sound you wouldn`t go back to other choices. But I have to say that the tube DAC needs to we genuine tube output stage, another words from the processor to the tubes out into your RCA sockets.