My advice is buy at Costco if you have access to one and NOT EBay. Try going to a camera store to gain knowledge about the different spec's of cameras that are available. If Costco is not an option for you I suggest a local camera store. Then you can return for ?' as often as you like. If you want to research cameras on line, www.dpreview.com is an excellent place to read and learn about most any camera there is today, including older models. There are several forums for just that purpose.

Having said all this, we have the Canon s400 (point and shoot) and the Canon 20d (DSLR).
Katz