My parents want to buy me a new camera for Christmas and I just want to pick the one that's better for the buck. To me, I don't really think the extra 2.1 megapixels is worth the extra $200+. Its main use would be airshow pictures, with a new 300mm telephoto lens.
XTi - http://www.usa.canon.com/consumer/co...&modelid=14256
XSi - http://www.usa.canon.com/consumer/co...&modelid=16303

