A good rule of thumb is budget about as much for wire as everything else.Nonsense. HEA is overpriced and price is no guarantee of quality or compatibility. A good portion of the cable market is visually beautiful yet egregiously awful electrically with unflawed components.
Cables interface components and must compliment. If they don’t, which is at fault: cable or component?
I’ve heard the ear-opening revelations millercarbon describes from simply replugging connections.
See http://ielogical.com/Audio/CableSnakeOil.php for some background on cable properties.