If cables are made of quality materials with no defects there are virtually no difference in sound when it comes to speaker wire of the sage gauge. As long as the cables you buy aren't crap, then you're good. If you hear a difference between two cables, there is something wrong with one of them.
The 10 gauge Emotiva 3m. X-series speaker cables are going for 59.99 for a pair (1 speaker). Here is the description.
Solid brass machined ends with 3 micron thick gold plating.
Dual-twisted, 10 gauge, high strand count oxygen-free copper conductors.
Strand Count: 455 x 2.
Interchangeable tips: banana plugs or spades (4 of each included with every cable).
Diecast, non-ferrous metal alloy breakout collar for added support.
Nylon braided anti-scuff jacket over PVC outer insulator.
Do you think its worth it? If only the thickness of the wires make the most difference I can get a 10 gauge speaker wire for like $5.00 at monoprice..