Probably not a popular opinion, but I think my black Rebel has to much black, even stock.  From the side, particularly when it's got just a bit of dust, it becomes a wall of black.  Definitely feels like it's missing something now that I've had it a few weeks.  The two tone Rebels have no such issue and look better in this regard to me.
I'm thinking of adding a character line, like the chrome ones the Limited's have.  Maybe a flat black or brushed metal look (to match the skid plate and front letters)?  No idea where to find it though.