agree with Double, keep with the Booster. i have one and would recommend it to anyone. Surf, spin, run rivers and yes even cartwheel. Compared with boats three years ago, the Booster is short. It is possible to flatwater cartwheel just about anything made these days except an Embudo or the like. S8 however, would be very specific for your skill level and possibly not the best choice overall. Work on the mechanics of the cartwheel and you'll be able to do it in many different kind of boats.