RE: windsurfing e.t.c
The Severne Microwaves are really good. They range from 2.0m to 3.6m. We spent alot of time in developing them to make them the best kids sails on the market.
What discipline are you into?
Are there waves where you live?
Definitely one of the Star-board Prokids board would be the go. They have a board for each discipline and have all been designed for people of your standard and weight. See if you can test ride some of the boards and get a feel for them.