Which digital cable to use with a Benchmark DAC-1

Utopia, to answer your question, digital cable does and can make as much of a difference as IC's and speaker wire. I would recommend you audition the Acoustic Zen Z=MC2 cable, which can be gotten used for a very reasonable price and offers great performance. The best digital cable I have ever heard is the Stealth Sextet, but it retails for $2500.00 and is worth every penny in my opinion.

In my experience there are significant differences in the sound quality of digital cables. They definitely do not sound the same. The transport to DAC connection is critical to the sound of your entire system. I would suggect that you narrow your interests to 2 or 3 cables then audition them in your system from the Cable Company. Keep the one you like and return the rest. I don't know what your connections are as far as inputs and outputs but I would suggest in order of preference: XLR, BNC, RCA. Good luck.
I am also using the Stealth Sextet.

You answered your own question........Stereovox HDXV, you can't go wrong and for the money, it's a steal!

Another amazing choice with highest quality and giveaway price is Encore Signature digital IC from Joe Mazzaglia at Auricle Audio Design.
His auction can be found under the search word "sucks" which doesn't seem very promising until you read the clever advertising copy.

Yes, my experience too is that the digital cable makes a difference as large as with the other interconnects. I use a LAT International DI-30 Signature, in a balanced version, which is recommended for use with the Benchmark in order to get the best sound. In my system LAT has outshone much more expensive cables. I would try several cables before settling on one.