I would check out some different snowboard brands and see if something catches your eye. Most major brands make really good equipment. Personally my setup is currently all Burton. Once you find something that catches your eye, you can come back with some choices, or use a sizing chart on the snowboard brand site you choose to find the right size.
Being on the east coast, I wouldn't go for a full rocker board. The east coast is known for having a lot of ice and a rocker board won't hold an edge too well. I would go with a combination rocker board. More edge hold, but more playful than a traditional camber board.
You most likely need a wide board also, since you shoe size is 13.