My favourite Greek hero is Harry Hamlin. Just kidding. My favourite from your list is Jason. Heracles was generally a pea-brained muscleman who even abandoned the Argonauts. Achilles was a selfish, violent jerk. Bellerophon I simply don't know that much about. So the only admirable one on the list is Jason, the archetype of a good democratic leader (the Argos is a symbol of democracy, of course).