PS Audio PW vs. Bryston BDA-1 vs. Wyred 4 Sound

I have the Bryston, and have heard the PS Audio extensively, and would say that sonically they are very close, with the PS Audio have a bit better upper end and extension (but smooth, not harsh) and the Bryston a bit warmer. The PS Audio is a bit more flexible, and that's what you are paying for in the price differnce. They are both excellent sonically, and I really couldn't pick a winner.

I have never heard the W4Sound, didn't know they made one.

the PS Audio Perfectwave is in no way, anything like the PS Audio DAC III including any mods that could be done to it. It is a completely different machine and shares nothing with the DAC III.

I don't think that's a good comparison.

I think the Bryston does have volume control via the remote. I am using it right now, so I am sure it has it.

Well, it's actually not full volume control, it let's you adjust the gain to 4 levels, from 0 to minus 3 db.