what digital cables for my dac?

Tobias, sorry, I think you're over-thinking my use of the word 'belief'. In this case, it was used in it's broader sense to mean something a person accepts as truth, regardless of source or experience. You believe it because you've experienced it, which is the preferred way IMO. I also believe shorter to be better because I've experienced it. Which really leaves us nowhere, (as usual in this hobby).
I was mainly trying to rebutt the 'technical' support for the longer-is-better argument. Not because I need to be right, but because I want people to trust their ears on a case-by-case basis, and not defer to anyone's 'technical' expertise.
Also, your friend with the 1 meter digital cable could 'swing either way' as it were, and go up or down a 1/2 meter for greater satisfaction.
Who knows? ;)

I have been very happy with Tara labs rsc digital 75,I used kimber before and thus cable is a lot better.

Apogee WydeEye is sounding great with my DAC - I beleive it to be a bargain perhaps because it is a "professional" product - available primarily from music studio places as opposed to high end places - about 40-50 bucks. some people cannot get themselves to hook up something this cheap to the rest of their audio jewelry collection - but not me.