Height does not matter when picking a board. How much do you weigh and how big is your foot? You want the width of the board at the bindings to be equal or slightly smaller than your foot. Your weight and style of riding will tell you how much flex you want in a board. Stiffer board for freeride and big jumps, softer for park.
What if you are really short for your weight. I think height does matter a little bit. To maintain the proper stance on my board, I have to adjust my bindings way in the middle of my board and that was barely. According to the "guidelines" I should have a 19-20" stance but I can't get it closer than 21" or so on the inner most holes.