Thanks everyone for your advice.
The 121 it is then - really looking forward to it and getting back into windsurfing again.
On the sails I note your points about the cams. They are such beautiful sails but quite hard work when something more free ride would now suit me much better. I might try removing just the foot batten cam, which is the one which makes rigging hard work and then living with the luff tube being creased here. I am not concerned about the big luff tube, its just the rigging time and the rigidity on the water that I was hoping to diminish a bit.