Cables do not improve SQ and can't even possibly do so given the laws of reality (physics). This is why blind tested no one can tell the difference over and over ad infinitum. But that's off topic and covered on many forums, just google around and research for yourself, if you must. There's really no reason to, thinking cables matter is like believing that gravity does not exist, the level of certainty is exactly the same. One can, of course, believe otherwise and spend otherwise, and that is their right, but there is no rational reason at all to do so.
Just buy a Sansa something and you'll be happy. The Nationite or Cube might sound slightly better (I haven't compared the two, let alone blind, so I wouldn't know), but all my Sansa's sound perfectly fine, almost as good as my Cowon D2 when tested blind in fact. I'm happy using any for cycling, especially the Clip, because, well, it Clips! (Ultimate portability).
