Monk is such a powerful class. If you choose human as your race, his primary disadvantage evaporates once you're half-way through the dungeon, and the rest is just gravy. Of course, I do find him a little bland. The Paladin and Warlord are nice, but I really just like them because I like HALPMEH and CYDSTEPP, which are otherwise very rare glyphs. So my vote has to go to assassin. Swift Hands to instantly catch Tikki Tooki

(yes, I encountered TT as an assassin and promptly swift hands him without having to knock down his death protection)