Who's the Best... Giant Monster?

Karen: Since the film "Pacific Rim" is coming out today (I can't wait!) featuring giant robots fighting giant monsters, I thought I'd turn today into a free-for-all where everyone's favorite king-size critters go at it. Try to turn your brain back to age ten and recall how awesome it was to see those gigantic creatures tearing up cities while they battled each other, and then answer today's question!