How long of runs and what is the impedance of the speakers? 16 gauge would be sufficient in most cases, it's really no more than simple science. And pick good connectors (I prefer locking bananas). Don't sweat the rest. Monoprice or Blue Jean are both adequate.
Frank Van Alstine brings his 1 inch diameter rope speaker cable to shows. That demonstrates how much he believes in fancy wire.
If you want to be anal about it, find out what Jim used inside the cabinet and match it outside the cabinet.