How old are you bud? while what these guys are saying may be true, you would be fine in a 12/14 din binding right now, but you may be due for a growth spurt. Im sure you are going to want to keep this set up for at least a season or two. In my opinion, i would get a 16 din binding. bindings work best in the middle of there spring rate, you shouldnt crank a binding all the way to the max as you shouldnt have it within 1 or 2 ticks of its minimal setting. a binding with a max din of 14 really shouldnt be set past 12. if you were to get a 16 din biniding, you would be right in the middle of its din threshold causing less stress to the springs allowing a longer more reliable life and release pattern.
this all depends on one major point though, how old are you?