So I'm pretty sure my first foray into buying a DSLR will be used. Which leads me to wondering what are some signs I should look for when buying used, etc. I see a common thing to list on ebay or craigslist are how many times the shutters been clicked. I take it this is similar in regards to buying a used car? They let you know how many miles are on it. How much of a price difference should there be between a new camera and a used one?