I think there's a lot of other circumstances you should consider that could help to you deciding....first how close do you live to the mountains? Will your parents be able to drop you off on the weekends? Do you only get to go once a year? If you only get to take the yearly family vacation, I would wait...you still have a lot to grow, and by the time your 15-16, you will have outgrown this board. With bindings and boots, you will end up spending more than you would if you rented a good couple of demo boards. When you're a little older and not growing so much would be the time to buy a board. Especially after you've gotten a feel for the type of riding you want to do.
But, if you're able to go often, and really just want your own board, Then I would prob go a different route. B/C you will soon outgrow the capabilities of this stick. Hope that helps :-)