"Until Death Do Us Part", "Zetman," and "Liar Game".
Until Death Do Us Part - hitman/mafia/international police/crime series, with bad-guy getaway cars being black evo VIIIs lol.
http://www.mangafox.com/manga/until_...3/c024/12.html
Zetman is kinda like your average superhero comic, only a lot more mature themed and very good plot and build.
Liar Game is as the name imples. You mysteriously win a large sum of money, but now you're in a game where you have to protect yours and steal another player's. Psychoanalytical material but not insanely complex.