FYI: It's Canon, not cannon, its a camera, not a weapon.

But anyway, look for a camera that has good ISO appetite. I use a Sony A300, while it is a great camera, it is rather disappointing in the ISO area, I can only take it to about 400 ISO before I have issues. Also make sure you lenses have a small aperture number.
That's about all I can say... I have no experience with anything except Sony and Minolta.