When it comes to cables, I have tried them all in my system. Hands down, the winner IMO for everything--interconnects, speaker cable and AC power cords is Nordost Valhalla. Forget about Shunyata and try the Valhalla power cords as well. They will bring your system to the top of the mountain.
Have a look at mine
http://forum.audiogon.com/cgi-bin/fr.pl?vaslt&1049587927&read&3&4&