The extras on the XSi are certainly worth it. The XSi for starters has a faster auto-focus ability, as well as a more complete metering ability (spot metering). No matter how much of an amateur or pro you are, that faster AF is a major benefit, the specific difference being the 9 point f/2.8 af sensor vs the 7 point f/5.6 af sensor. The larger LCD just seals the deal. If moneys real tight then that XS isn't a bad one, but I would certainly have a much stronger inclination towards the XSi.