Cables: People have different takes on this subject. I can only give my own experience (and it's exactly that - nothing more, nothing less). Like Mike, my dealer lent me three sets of cables to compare. I kept them for over a month and kept each in my system for at least a week. Listening over extended periods, I found that I could hear some differences and eventually preferred one over the other two.
Again, just my experience. I know that others have different opinions. If you can find a cooperative dealer, try to do extended comparisons and judge for yourself.