Cables matter. That said, the biggest upgrade worth having is simply to buy a good grade of cable engineered for what is needed, and that does not have to cost a lot of money. Once you get past the basic stuff that comes free in the box, and move to a connection that covers all the basic of conductivity, shielding, durability, etc then the benefits of going past that are truly minimal. You can't go beyond the laws of physics and electricity no matter how much hype you add to the product :-) Good cables matter.