I'm actually torn on the whole cable debate. Half of the stuff I read and see say that audiophile cables are nothing but snake oil. The other half literally swear they alter the sound signature of a headphone. One guy did a blind test where he had a bunch of audiophiles listen to headphones on varying cables (one being a re-purposed coat hanger, another being a run-of-the mill cable, and the other a true audiophile cable), and when asked which sound they preferred, the coat hangar cable actually won about 30% of the time, while very few selected the actual audiophile cable. Of course, the participants didn't know which cable was being used, otherwise that would taint the results due to psychological expectations.
As they say, perhaps the truth lies somewhere in the middle? I can't imagine so many people would pay $300-$400 for a high quality cable if it was all BS, but at the same time, there's also quite a bit of objective evidence saying they don't really make a difference unless you're comparing them to really crappy cables. What's been everyone's experience with audiophile cables, especially for those of you that have the Denons and/or Fostex's?