It's short, easy, and there's a penguin. It's definitely on my reread list, so if you fancy getting it and launching a discussion I'll join in. Should interest literary types as he was getting so weighed down by all that hard philosophy that he had to find something to lighten his soul - Wordsworth and the other romantics brought him back from the edge.
The stoics are very interesting, but you musn't skip Socrates, Epicurus, the Cynics and the skeptics! Pierre Hadot's "What is Ancient Philosophy?" is a great intro. to all this gang, not a difficult read either (amazingly, for a French philosopher