although it can get costly the nice thing about the rebel is the ability to change the lens to your needs. if you want a really big zoom for wildlife pics you can just find a lens and go with it. with the sony you will be stuck with the lens on the camera, although a good lens you may decide you need more at some point.
Here in the US the price for the sony is about $500 and the rebel is about $650.
Also because the sony uses a lower quality consumer point and shoot stile ccd the noise is horrible and if you plan on blowing up images you will get very bad lookiing grain. the Digital Rebel has a professional series sensor that does not have nearly the same amount of noise in the photos when blown up.
I would recomend the canon onver the sony but I would also recomend learning how the manual settings work so that you can really take full advantage of the camera, also I have discovered that it is not really that much harder to carry my canon 20D than it was to carry my digital elf.
good luck on the decision.
also the prices I quoted were from
http://royalcamera.com i have never done business with them and do not know how good of a company they are so I would recomend research before you purchase anything.