Mike,
I owned the Reference DAC and preferred the Playback Design, Iv had a loaner on the select 2 from a friend for about 10 days. I still preferred the Dream Series from Playback Design. Overall i think the MSB are very nice DACs but the Playback Design was less fatiguing and DSD on the playback was outstanding.
Obviously i can not compare the Wadax to the Playback Design Dream Series but the price alone would have you think the Wadax is a better Dac considering its almost 6 times the price tag.
For digital i tend to lean to something that is less fatiguing and musically evolving, The Dream Series keeps getting better with every software upgrade Andreas releases.
I would imagine your Wadax would be the Reference DAC for the next couple of years and im not suprised about system synergy Its always better to use the Streamer and DAC from the same company.
The Playback Dream Series also uses its own Proprietary Fibre Optic Cable from Streamer to DAC, Iv tried a bunch of diffrence Streamers connected via USB and nothing could match the Performance of the fibre optic cable.