I find all this rather silly... the miniscule reduction of electrical resistance with the high purity silver wires is completely drowned out by the resistances within the source and the amp (i.e., the output impedance of the source, and the volume pot and other series resistances in the amp circuit), which are probably many orders of magnitude higher than that of the interconnect (unless your interconnect is miles long).
The things that one should be more concerned about in interconnects, is not how many 9's purity (be it silver or OFC or whatever) the conductor is made of. It's proper shielding from interference and the capacitance-per-foot characteristic of the cable. These two are mostly conflicting requirements, because shielded cables tend to have higher capacitance, so it pays to use as short an interconnect as possible. Use good quality plugs and connectors for solid, tarnish-free contact, but there is really no point in obsessing about the conductor material.