I should receive my isonic 50 speed board tomorrow and am wondering which bigger isonic i should get? I am 76kgs and sail rs racing 6.7m and 5.8m and sail flattish water lakes. I am into speed and am wondering which is the better choice - isonic 87. 94 or 101? Keeping in mind this will be my biggest board i ride in 12 + knots. Any advise would be appreciated.