Late to this party, but what the heck...
I came to the Auidiophile World kinda backwards, starting with DIY speakerbuding, then going to shows. Kinda blew my mind seeing prices on stuff, as well as what kind of stuff can command such. I have an electronics/engineering background, so I was/am pretty leery of $2000/ft speaker cables and "good rule of thumb is spend 20% of your system price on interconnects", and such. Ah well...
But, I believe in evidence based "good enough", and for cables, thats pretty low. At least probably below the 2-3 figures level rather than the 4 or 5! Me, I like Blue Jeans cables and their philosophy. They make basic but good stuff, quality wire, decent but not crazy connectors, you know the wire manufacturer and can look up specs, etc. And, cheap, er, affordable!
I did like the shielding test Amir came up with, with the transformer. One of the jobs of an interconnect cable is shielding. I'd like to see a test of several RCA and XLR's comparing that, as a one off test.