What's fun? The first time I played a Paladin and I can't see it getting any better then wielding Casomyr. Now I'm thinking thieves are always cool, and the power and variety of a mage would be welcome. Finally, how is it playing as a simple warrior?
Honestly, though, I have a lot of fun playing Sorcs. I like playing melee classes only for the cool shit I can end up wielding, but that's about it. Monks are different though, I just like smashing shit to pieces.