Should I paint rims black?

They do look super nice now, but Mopars with black wheels look tough as well, a little more 'muscle' and a little less 'granny'.. if it's at all possible you might try to find a black junkyard wheel to mock up just to see if you will like it before making the change.. That said I would have them powder coated rather than paint them, much tougher coating and will last much longer. Out here in everything's-more-expensive-CA I had a pair of steelies powder coated about 6 months ago they charged me 40 bucks a piece