Another vote for the AQ Diamond USB. I'm using it between my Mac Mini and my Ayre QB-9 and it's staggeringly good. I did a few blind comparisons with the wife and she was afraid to give me her opinion. Finally she told me that the Diamond (which she didn't know which it was) was so much better than my standard cable that one was like being at a concert, the other was listening to a Bose wave radio - which he have in the kitchen.
The difference the Diamond made in my system was nothing short of jaw dropping. Super highly recommended.
The difference the Diamond made in my system was nothing short of jaw dropping. Super highly recommended.