Macintosh's (the audiophile co. not the apple computer) former head design enginner "did the math" with you guys as lab rats @ several major cons. Fact of the matter is you can talk all you want about "chrystiline structure" and what not, but when it comes down to it, as long as it is not corroding inside the jacket (increasing resistance) COPPER IS COPPER.
Silver (& others) are better conductors, but with modern equip, there is not any reason to be sweating that, so keep your silver with the fine china.
I'll not hassel anyone for paying slightly more OFC wires, but you might as well just get quality zip cord (lamp cord) or even that old Thermostat Wiring that i scavenged 6 spools of durring a building upgrade at my office. (and since have used to build and repair just about everything in the past 3 yrs, including rewiring the whole rear end on a Volvo)
So, don't sweat what brand it is, just don't use something that is going to be green inside the insulation.
just use the right guage for your speaker runs and pretty much whatever for your interconnects.
If you want something cooler than the off the rack stuff or one you made with a set of Transistor Hut's El Cheepo bag o' assorted phono plugs, then pick up some pretty hardware and some nice colour co-ordinating jacketed wire and DIY and have some pride in it.
Fifty dollar wire sets sound better only if you know they are there. today's word is Placebo. Can you say Placebo boys and girls?