The stock power cord is your best bet. Power cords do virtually nothing to alter the sound unless the one you are replacing is defective.
Right. Black rubber power cords are the pinnacle of state of the art high end performance. That is why they ship standard with all components including the very finest cost no object amps. Every manufacturer from Panasonic to Pass knows this, and that is why they all ship the same quality power cord. There is none better at any price, and they all know it. If only more audiophiles were better informed. Your voice is shaft of golden light while all around is darkness.