If you're into lighter winds and glassy fun get either a wide, flat TT or an F-One Bamboo Fish.
I am just under 80kg, 6'1 rider.
My TT is 135*48 cm with minimal rocker. Fantastic light wind weapon.
My F-One Fish is 5'4"*48cm. It goes upwind almost as well as a raceboard, goes in light wind about as well as the fat TT. I generally use a kite 1-2 sizes smaller than anybody else.
It is not a surfboard but it does carve well if you work on your technique. I have not used any of my other boards since I got the Fish. I ride in and out of the straps with lots of foot switching. So much fun.

I would avoid a pure surfboard unless you want to go in the surf. The rocker of surfboards generally makes them slow, especially in lighter winds. Strapless is fun. It feels great to be able to wander around the deck at will and carve turns on the rail (which the Fish is great for).