Locke today, Locke tomorrow Locke forever!
OK, that sounded a little scary like some fundamentalist speech

But seriously I like the complexity of this character, his personal-journey is the most interesting one to me (a lot of tragedy and adventure in Ancient Greek fashion) and his mysterious connection with the island is a pleasure to watch (I love it when he greets those tropical showers when everyone else looks for some shelter)
Next is a tie between Hurley and Sayyid.