IMO the power cable is another of the audio myths, and IMO is a bunch of BS.
In some opinions, engineers, experts, etc, that, of course, will be crucified by the power cable manufacturers, and the believers, after you reach a proper gauge of wire that let you feed the needed current that you PSU needs to give the adequate DC to the amp, it doesn't matter...All what matters to a very well designed PSU, inside your amp, is the DC that will feed the audio circuit, I do not recall of any amp that works with AC yet...Again if you have a well designed PSU...and most of the times you does...There should be no problems...
This is just my personal opinion, I have Quail, $14.00 and nobody will convince me of getting any other....And I got it, mainly because of that it is well done, cheap, and mechanical superior in comparison to an stock cable, but even an stock one, 18AWG or bigger, will be more than enough to satisfy the more extreme demands of any audio amplifier for normal listening levels...