This is a little like asking about turbos/supers. The first question for you is: how do you plan to use it? Family photos, sports, vacation, portraits, etc.?
My daughter has a Canon EOS. The camera itself is nice, not super capable but cheap (relatively speaking). The real key is to get good lenses. Any pro spends their money on quality glass, not megapixels. The nice thing about Canon is they have a 50mm 1.8 lens for $100. For almost all cases, you would find yourself leaving that lens on, unless you need a really long zoom for something. It's good in low light (and the on-camera flash on most cameras is usually useless except for close photos), good for stopping action in medium-to-good light, and excellent for portraits. For an all-around camera at a low cost, it's pretty hard to beat. Craigslist or ebay is where I'd start too. JMHO