Thanks guys for your thoughts. I already own a 120 Aero for the higher winds. What started the hunt was the consideration of getting a bigger rig for the GO. Say a 10 or 10.7 but to do this I need a new boom and sail and I was wondering if it was a better option to change my board. Now realising that the Go will plane faster than a Futura I am not so sure a new board is the answer.
The other thing for me to consider is were I sail I can have up to a 15knot variation so sometimes I am riding my 9m in 18knots gusting 20.
Ken, I am not sure I understand the difference between the Isonic 155 and the Formula, I thought they were both race boards and I thought they would handle the higher winds better than the Go. What do you think?