Silver or copper cables?

Gents, I think this is being overcomplicated. For cables, silver would be a better choice simply because it has less resistance. This winds up to be a simple cost issue. Copper is an excellent conductor and less expensive while silver is a better conductor than copper but more expensive. It's as simple as that.

I appreciate your simple answer Liguy, if only others could give a simple opinion.

Silver wire has about 10% lower resistance. If you were to go from 16 gauge silver to 14 gauge copper, the copper wire would have about 50% less resistance.The same is true going from 14 silver to 12 copper.

And 18 gauge Zip Cord?

I recently upgraded from Kimber KS-1120 to KS-1130 (the same interconnect with high-purity silver instead of high purity copper). I wasn't blown away by the difference, but it does seem to be better. The sound is a little more finely "etched" now. I'm not sure whether there is actually more detail, or a slightly more distinct presentation of it. I can't say absolutely that the difference is worth it at retail prices, but I got a good price on a used pair and have no regrets.