I've got quite a few brands of power cords from all budget ranges including many mentioned previously in this thread (i.e. Shunyata, Verastarr, Signal, Maze, Pangea, Supra, MIT and others).
Other than avoiding anything by Synergistic Research like the plague, I can't give definitive advice like others have given.
Personally, I would recommend waiting on power cords until the very last thing to upgrade. Ironically, the worse the power supply in your equipment..the more improvement a power supply can help. Thus, it's better to just save up and address the problem at its source...get better equipment with better power supplies.
If you notice, external/third party power supplies are all the rage now in digital. That's because people realized it's the power supply more the power cord that impacts performance. Power cords were just a primitive band-aid.
Certain power cords can also hurt your overall performance. Some of my highest cost cords sounded the worst on other people's systems and gear. Sometimes shielding a power cord is better...sometimes it's worse...etc.
Theoretically, a low inductance power cord cord can make a difference on any gear. However, the delta in improvement - both measurable and audible - isn't always very big or guaranteed positive. Many of these high dollar cords are just show, not substance.
If you do get a cord, always get a trial period and experiment on different gear.
