Hi Audiofan,
Just thought I'd mention that the general consensus around these parts is that as long as the wire is of thick enough gauge to carry the current the distance you need to go, all is good. However, as somebody mentioned, shielding verses interference can be an issue and some coax and RCA cables are indeed shielded better than others.
I guess the point I wanted to make is that when you referred to "high quality" cables, I wouldn't worry about paying big bucks for crazy priced, audiophile brands. As long as the electrical signal gets there unimpeded, the sound quality will be the same.
I am pretty sure you just referred to some thicker, shielded cabling but thought I'd throw this out there, just in case.
