Hello cametz,
You will likely find as many opinions on speaker wire as there are people to give them. As soon as you find one company that says their math/calculations/listening tests say X design (i.e., super low capacitance, solid core so no strand jumping, etc.) is the absolute best, you will find another company saying the exact opposite (capacitance doesn't matter, strand jumping doesn't happen, Inductance is the issue, etc.).
My personal religion is that a stranded, low inductance (which typically means higher capacitance) cable is the best up to the point where the amp starts having trouble pushing the load (will be amp dependant). As a general guesstimate, cables over 10 feet or so should be lower capacitance. I have found 12-14 awg to be pretty optimal for most speakers and 10 awg necessary for longer runs (25+ feet), full-range speakers that need current (i.e. RM40s), or subs. All the wires I have heard with a solid core larger than 16 awg muddied the high frequencies too much IMHO.
I usually tell folks to just start off with whatever they have on hand that is of reasonable quality (i.e., the 12 awg Speaker King speaker wire at Home Depot). Once you have lived with your system for a a month or so and know how it sounds, then start playing around with better wires. You will likely hear a somewhat significant difference when using different wire. However, don't confuse "different" with "better". Sometimes it is, sometimes it is not. Even though a particular speaker cable worked wonders in a friends system, it may sound horrible in yours due to different amp/speaker/length/RFI/EMI/etc. There is no substitute for hear something in your own system.
For my demo system, I am using my own design. I am bi-wiring using low inductance, stranded, 10 awg equivalent copper for by bass and 14 awg equivalent, braided, silver covered copper for my mids/tweeter. It sounds incredible in my system, but would end up being a $300+ cable if I ever decided to sell it (which is too expensive in my mind). If you want something that sounds pretty good for cheap, I suggest finding the Stan Warren design and doing it yourself.
Best of luck.
Julian
www.sedonaskysound.com