Just a simple guy, but I seem to remember that current squared times the cable resistance is the voltage drop across the length of a wire. I found "Monster like", clear 14 gauge twisted pair, at the local Home Depot for $.32/ft (along with some misc. 2x4's).
Granted we are dealing with AC and it's not really that simple, however, the audio frequencies are fairly low and capacitance and inductance should not be much of an concern (unless you coil up a several dozen feet).
I'm not an expert, however, I would be real surprized if you could measure a difference much less hear it. I think this topic becomes more important when you spend 5 firgures for speakers and must compensate with the most expensive cable.
Don't confuse cost with value and don't forget Ohm's law!!!