Surgeons. Surgeons are all about taking risks, crossing the line of infinite possibilities, and at the end, whether they win or lose, face reality and regret nothing. They do not regret attempting to save their patients' lives. Like the cast of the series I am currently addicted to, "Grey's Anatomy", they are the exact reflection of the description posted- the right balance of work, life and love. Well, mostly work, but you get the idea.