My wife wants a digital camera for Christmas. Money's a little tight but I'd like to get something reasonably nice. Our 35mm camera is a Canon Rebel EOS, and I'd like something comparable to that. Failing that, a 4-5 megapixel digital with optical zoom. Is used worth it? Am I better off just looking new? Anyone have any suggestions where to start? A digital Rebel is what she really wants, but it's just outside of my price range new.