Monks - Specifically, unarmed Monks. I love them because they rely entirely on their own selves and get results that are beyond what people beleive they can do. To me they represent a portion of the potential within humans (or whatever race you want to play). Who else can shatter solid stone with their bare hands? Who else can train themselves to run so fast they appear as a blur? Who else can defeat that most formidable of opponents, age, through their own virtues, rather than magic? And that's just the tip of the iceberg To me, the Monk represents what ernest dedication and determination can really do.
As of this post I am surprised to see the Rogue in first place, and the Cleric as high as it is, but my predictions on the bottom four were dead on, with Psion, Psychic warrior, monk, and druid. Rangers and Paladins have always been my favorite, with wizard next in line. I can't imagine ever playing a Bard either, there's just something kinda lame about singing and strumming a harp while everyone else around you if fighting for their lives...