Given how you are 13, you prob are light weight and couldn't really use a 14 din binding. The best bindings for park are the Look/FKS pivots, or the top of the line marker binding (whatever it is called, jester?). Both those bindings only come in 14's at the minimum so they are too much for you, unless you are abnormally big for 13 years old.
So on that note I guess I would suggest look px12s. Decent binding, 12 din, better then the lower end markers for sure.