Upgrading

Changing out cables is fun and easy so I do it sometimes.

@malbor 

Without knowing your equipment, we have no idea what to suggest and just because something is old , doesn’t make it bad or obsolete.

Shunyata is my go-to for power cords. Not sure about your system or budget, but if you buy used I'd recommend CX series or better. 

@malbor 

You don't have to listen to JasonBourne's spiel. He spouts the same negative attitude on every thread.

+1 ghdprentice for letting us know what is in your system. 

Agree with most that power cords is where I’d start, but it depends on the quality of the components. If your components use quality power supplies and your line isn’t that dirty (or you are using a quality power conditioner or regenerator) then power cables are the best investment. Otherwise, speaker or interconnects would be where I would focus.