I am new to dslr's. I want a nice starter camera, but one I will not outgrow as I learn more. I have been looking at the Canon xsi. I would probably start with the 18-55 IS lens, and purchase a telephoto later, after possibly renting a few to see what I like. I would like to do general photography (mostly my son, as he grows and participates in sports and such), and also wildlife photos. Will this camera work for what I want, or would I be better off stepping up to the Canon 40D? Would I outgrow the xsi, or is the 40D more than I need? I have no plans to do this prfessionally. Strickly as a hobby. I would also be open to suggestions for other brands and/or lenses. Any info would be greatly appreciated.