I think as long as you're using copper (not cca) and have the appropriate gauge for your runs the rest is pretty inconsequential when it come to audio.
I'm no engineer tho and try to keep an open mind. If someone can prove with a DBT or something that their cables offer something special then I'll be a convert. So far, that's never happened to my knowledge and most of the folks making the claims tend to not want to participate in backing them up.
Just for fun, check these guys out. This'll make your ee blood boil, lol.
http://machinadynamica.com/machina31.htm