Hello, I am really skeptical about buying used or refurbished items, especially when the cost is high. I am looking for my first dslr and back when I worked for best buy in 2004 I wanted the 20d. Now its several years later and still want a canon dslr. So I made my mind to buy it(Canon 40d) a Circuit City with the no interest until 2010. But saw a canon 20d on backpage.com (Craigslist.org) type site. for a 20d for $500 with less than 1000 shots and all accessories mint condition. Bottom line: What do I look for when buying used or checking out the used item? Anything I should look for or now just by looking at it and turning it on? I never owned a dslr or spent much time with one. Any advice will be great.