I bought an AQ Thunder power cord for my Codex on the recommendation of my dealer. Money well spent.
@gdnrbob Nice seeing your endorsement of the AQ Thunder. I just ordered one today - a discounted dealer demo. I've been noticing the AQ cables are less susceptible to ground noise and RF than my other power cords - even the cheaper AQ PCs. I decided move up a bit to the Thunder for use with my amp.