Which digital cable to use with a Benchmark DAC-1

I forgot to mention that the interconnect and power cable you use with the Benchmark will greatly affect the sonics. See my recent review of the Benchmark under Product reviews.

I disagree with you2 guys about Stereovox nothing
under 500 is it's match. I am using the Accustic arts dac mk-3 and the AArts transport .It just gives so much more inner detail .I am using the new balanced model.
with less expensive gear it exposes all the weaknesses.

Pjl2122, balanced model of Stereovox is a different cable. It costs around $350 if I'm not mistaking. The RCA version of Stereovox, the HDXV, is about $100. They are 2 different cables, cost and construction wise.

In my experience the KS2020 is a spectacularly good cable but too good for the Benchmark, the Zen MC2 is one of the worst I have heard (not even close to a 75ohm cable, so what do you expect), but for a cheapy that suits the rather thin and slightly strident sound of the Benchmark I reckon the single ended WideEye is a good match when terminated with Canare 75ohm plugs.

Redkiwi, Your point is well taken that if components are not at high enough performance level then a more forgiving IC is better tolerated.
It is not always a good idea to dumb down (as in school curriculum choices), but following your thought, it is better to enable pleasing synergy until one hears and can afford still better sounding components.
On the other hand, I think many of us have had the experience of unveiling more sound enjoyment from a component upon inserting "better" interconnects (regardless of price).
If what is unveiled proves less satisfactory then this may serve as a goad to start saving for the next purchase which will sooth the restless audiophile soul.