The boards "waist width" will determine that. check the deminsions for the size board you are getting in the "tech specs". If possibly stay away from wides and mid-wides. this will turn your snowboard from a porsche to a buick.
but in the pow pow a porsche sucks and with a board thats too narrow thats exactly what your gonna find is your going to be wading through the deep stuff as your buddies put up hot laps chasing that sexy virgin white stuff