I'm going to get a new snowboard and I'm a pretty experienced rider. I am 5' and 100 pounds. What size am I?

I ride goofy and I ride all terrain but mainly park. I do rails, boxes and some jumps. When I'm not in the park I can do anything from bowls to glades and moguls. What length board should I buy and do you have any recommendations on what kind/brand of board?