I am looking to buy a digital SLR, mostly for action sports photography and nature photography. I already have a canon film slr with 2 lenses, but they are stock sigma lenses so switching brand really doesn't matter to me. Here are some questions I want answered Is the XTi better than the XT? The screen is bigger, but what about other features? I really want a bigger screen than the XT, but how is playback on the XTi? What about the d70s vs these 2 canons? How is one better than the others? How is the 18-70mm Nikon lens compared to the 18-55mm Canon counterpart? I don't want to buy a camera and get stuck with a terrible lens. (I know these are both not amazing, but they are what comes in the kit) How is the Nikon 50mm 1.8 vs the Canon 50mm 1.8? Thank you for any help at all, I really can't tell which would be the better camera for me. I want to think about lens investments too, so that is why I ask about the 50mm's.