I owned the Rockna Wavedream Signature (top model) for a while along with the matching Wavedream Net server. Excellent dac that was a very close with the Mola Mola Tamaqui dac I had at the same time. There were plusses and minuses to each. That being said, they are both gone. I recently acquired a Jeff Rowland Aeris with Super Cap PSU (amazing) for system 2.
However, the heavy hitter right now in my books that handily beat both the top level Rockna and Mola Mola dacs is from Aries-Cerat. It is the Helene dac- we did close A-B comparison's at a buddies place and no contest- There was more sparkle; life; and openness to the top end of the Aeries-Cerat dac that the Rockna and Mola Mola simply couldn't match. One day I hope to be able to get the Helene's 'big sister' dac the Kasandra II. Check the feedback on the Kasandra dac over at WBF. This thing is insane- it's a 135-lb dac. I have seen it at a local buddie's place, but have yet to hear it. Yes it's the price of a nice used BMW, but if you truly want to hear the next level in digital and just end the chase, this is it IMO.