Quote Originally Posted by thekingb View Post
True, but note that the dominant issue in this thread is things like autofocus and weathersealing. No matter how good a photographer is, the photographer does not control autofocus. The camera body and lens do. So, a 7D or 5D3 would be a better tool than the XSI if autofocus, for example, is your main issue.
First, photographer can control autofocus selecting the focusing point. And there is a second level of control, very interesting in my opinion: turn autofocus off.

Second, when I say stretch to the limit I mean questions like how many pictures did you miss because of the autofocus? Did you try every possible configuration of the autofocus system? Did you try manual focus? Did you take pictures under heavy rain often enough to need a 2.000$ camera? A 50$ rain cover or a plastic bag with a hole would be sufficient?

Unless you can answer questions like this (an many others), precisely because you know well the limits of the camera and your personal needing as photographer, nobody can say what camera is appropriate.