Anticables Level 3.1 Reference Series USB is very good. Used is under $200.
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Take a look at the Pangea Audio Premier XL USB Cable
It should make a considerable improvement in sound quality because it separates signal and power
There is also a similar product from Doukmall on Ebay
I've used the Doukmall and it worked extremely well
asahitora - re:...
does that matter in my application since power isn't needed?
That may depend on the "geometry" of the cable i.e. how the internal conductors are arranged.
But basically, It would not be an unreasonable assumption
However, if the power conductors are connected to the computer USB supply, there may also be some noise transferred to those conductors that may impact the signal
For example - the antenna on a radio transmitter does not canny any current as such, since is is only connected at one end, but the "noise" on the antenna is considerable.
Some may consider that any such noise to be of no consequence, but since my own experience with building IC's and hearing the difference that seemingly small changes have made to my system - I tend to lean in favour of caution.
Hope that makes sense.