If this is primarily a sreet setup, why not go with a rangefinder? Lightwight (Mamiya 7ii and others excepting), fast, easy to use. Some with interchangeable lenses. 35mm or MF. Well worth looking into. My personal advice regarding a second 35mm SLR setup would be the Minolta due to personal experience. But you name good systems and seem to have a head for it. Go with what is affordable.