Many salespeople will try and get you to spend thousands of dollars—just on cables! Often this is just modern-day snake oil, so be wary of what you hear.
Wiring and cabling are the plumbing of your home theater. If a plumbing salesperson came to your house and told you that all your plumbing was inadequate and had to be replaced with $1,000-per-running-foot, gold-plated, high-pressure, 6-inch-diameter piping, you would tell him to go and (insert your favorite impolite phrase here).
Don't be hustled by audio/video salespeople trying to sell you overspecified and superexpensive wiring and cabling. Here's some information to help you understand what is important and unimportant about wiring and cabling.
Let's start with a little bit about wires and ...