Nobody has mentioned JPS Labs Power AC. I like it a lot and there are some favourable reviews at Soundstage also.
I found that the Harmonic Tech AC-11 sounded completely different in my system than the JPS Labs. All the power cables do have a different character. I tried the 15amp (stock) cord that came with the PS Audio P300 on my amp, and it improved the bass tremendously but, it was sour in the treble. So I don't think it's true that just any cheap cord will automagically give you a perfectly satisfying sound, unfortunately you still have to find the right one just like with other wires.
I found that the Harmonic Tech AC-11 sounded completely different in my system than the JPS Labs. All the power cables do have a different character. I tried the 15amp (stock) cord that came with the PS Audio P300 on my amp, and it improved the bass tremendously but, it was sour in the treble. So I don't think it's true that just any cheap cord will automagically give you a perfectly satisfying sound, unfortunately you still have to find the right one just like with other wires.