You could consider a Nacra 5.8, heaps of them around, you have the weight to hold it down in a blow, you could start with the old smaller jib and stiff battens tied in loosly just leaving a slight wrinkle in then pull on heaps of downhaul. Will carry whatever weight you put on it, handles beaches fine, just paint an epoxy paint on the last 2 inches on the bottom as a sacraficial layer if your dragging it up the beach. I sailed my 5.8 in heaps of wind as a novice and had great fun, here's an old video of my 3rd time out on the old one with a novice crew if your interested, it was blowing with steap enough waves to jump over one through the next for a while and we didn't go over.
http://youtu.be/X70tEeWpDrY