Bigkidz makes a good suggestion - go for a dedicated line (or two) first. After that, absolutely demo any power cables in your system before you buy. Some good choices are listed above - I would point out that Electraglide and Shunyata have also gotten good reviews/press.
However, I would caution you in jumping in wholeheartedly into multi-thousands of dollars worth of power cords. Power cords do make a difference, but make sure you figure out whether the differences you are hearing are positive ones! For example, oftentimes, that "authoritative bass" you hear in a new PC really is really a recessed trable and exaggerated midbass, which are calling your attention to that range of the spectrum. Unfortunately, I spent too much money learning this lesson the hard way.
However, I would caution you in jumping in wholeheartedly into multi-thousands of dollars worth of power cords. Power cords do make a difference, but make sure you figure out whether the differences you are hearing are positive ones! For example, oftentimes, that "authoritative bass" you hear in a new PC really is really a recessed trable and exaggerated midbass, which are calling your attention to that range of the spectrum. Unfortunately, I spent too much money learning this lesson the hard way.