Talk is cheap. Rather than state that speaker cables are all the same or vastly different, why not actually try them? I used to be of the belief that the idea of differences in speaker cables, power cords and interconnects was snake oil.
However, there was a simple way to prove it. I contacted at least 9 different companies and they were willing to let me audition their respective cables in my home for 30 days. The only downside is that I had to pay shipping.
After experimenting with Wireworld, Straight Wire, Transparent, Home Grown, Signal Cable, MIT, Cardas, Acoustic Zen and Nordost I came to the conclusion that Wireworld Silver Eclipse was my personal favorite.
Does this mean that this particular cable is the end all be all? No, not at all. As they say - De gustibus non est disputandum. If you don't mind driving yourself insane and paying for shipping, I would bet that you would find that cables do indeed sound different. Is it worth the hours of changing out cables and spending time sampling and listening? Some people will love it and some people will dislike it.
The only downside is that after you select your favorite cable, it costs a pretty penny to purchase them for your system. Is it worth it? I believe it is. I feel a synergy to my system with all matching cables from one manufacturer. Am I crazy? Perhaps.
I would suggest, try it yourself and let your ears decide.