I'd recommend the medium. Then experiment with finding the best seat position. I think it might be more forward for your weight. The best location (i.e.: "sweet spot") will noticeably provide the best stability, carving, and confidence when you find it..thank you, probably going with the karma. just wondering what size i should get. im 5'6"-5'7" and 190-200lbs without gear. also im planning on purchasing a happy set for it, i dont know how much they effect the sizing.