So you think wire conductors in cables are directional? Think again...

Perhaps a more pertinent / relevant question is the difference between solid core vs stranded cable. The difference can be very distinct. I find good solid core such as AQ or Transparent to have a very solid grounded sound whereas good stranded cable such as the QED Genesis Silver Spiral has a marvelously airy sound and huge soundstage. Directional signal flow optimization may indeed be real, but the difference is not near as much. I do own directional speaker cables and have experimented.

I like: Silversmith, Inakustik, Black Cat and for value Analysis Plus. What I have heard from Purist was also extremely good. The best small company cable I have heard is Bionics Cable which may have to be made to order. 

Yup, a conductive alloy that is liquid at room temperature....and has been used to very good effect in audio cables for over a decade.

Cheers