The Canon Xti isn't a 35mm camera at all. It is actually slightly less than 22mm. "Pfffttt, big deal your totally nit picking" you say. Well the difference is at least $1500+ and it will hugely effect your photography. You should do some homework on sensor sizes. While your ~22mm camera can use the same Canon lenses as the actual 35mm cameras (such as the 5D and 1Ds), their effect will be changed and you will likely buy completely different lenses with a 22mm camera (or 1.6 crop sensor) than you would with a 35mm camera.