Well I'm Ichi Kyu in Shotokan so naturally I'd suggest Karate. I had a friend who was about your height and size and he's a Blackbelt so I guess it fits, however I would have guessed Judo (not that size has ever stopped me throwing somebody). Being big would stop people throwing you a bit and it is suited to strength. oh and a true Karate-Ka does not want to "beat the tar outta punks"
