I'd go like this.
SRII: The Last Son Of Krypton, this story would revolve around the death of Jason.
SRIII: The Man of Steel, this story would revolve around Metallo
That way, the titles aren't just titles for titles sake. They make sense, and represent the movies they are. I hate it when they just attach words to a title to make it sound cool and profound, while not really describing the movie they stand for, (example: Batman forever, that movie had nothing to do with eternity, in any way shape or form).
My way, they are cliche titles of Superman stories, but they have some meaning to them, make sense?