Well, I am personally a Canon fan, but take that with a grain of salt as I have never even owned one

. In my research, they seem to be a favorite of a lot of people along with Nikon. I personally fell more comfortable with the way the Canon zooms (its opposite from a Nikon, atleast on the kit lens), it "feels" better, and I know several people with them so if I run into trouble I know people more familiar than myself with the camera. Heres my two cents on the camera though. I guess I dont know your experience in photography, but a $1500 30D is a hell of an expensive way to start. If I were you, I would look at an XT or an XTi instead, then take that extra cash and put them towards some nice lenses. Say you get an XT and an extra lens or two and you dont like it then you still shouldnt have any trouble moving your stuff, but should you get into it and need something more than the XT, you can still keep the lenses and upgrade to a 30D then. Just my 2 cents...
I think a better question is if you dont know much about what you are buying, why
wouldnt you want someone else effectively spending your money?