Canon rebel xti, Canon 40D, or Canon 5D?

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Yes, I know the 5D is best...but in order for me to get it, I'd have to wait to save up more money...I want one NOW...Does anyone have any of these or maybe wanna try to convince me to buy a Nikon or something else? I could really use the suggestions, because this is my first step up out of the world of point-and-shoots...