OK, then I will be more specific, I have owned the Cullen modded PS Audio and found that it was not in any way in the same league sonically as the the two units I mentioned above, especially when considering cost.
I have not had the Wavelength in my system, but have heard it and thought it was OK.
The MHDT is one of the few real "Giant Killers" I have every heard, and the Bryston is in many ways the best DAC you can buy at any price.