I don't know if it's been mentioned yet...but there is a big, big difference between anything in the Rebel line and the XXD cameras (40D, 50D, 60D, 70D). The sensor is actually the same in most of them, but it's the size and layout of the body that are different. I personally find the Rebels rather small in my hands, and I'm so used to the control set up on my cameras, that I find the rebels frustrating to navigate.
It's not really something that you see & feel when you compare cameras on-line...but if you go into a store and put a Rebel next to a 60D or 70D for example, you will actually see and feel the difference. (I don't know about the 70D, but I recall that the 60D is actually smaller than the 50D and those before it.)