Replying to STH 12/PX 12 vs. STH 14/PX 14

So i'm gonna get either some STH's or PX's for this next season but I can't decide if I should go with a 12 or 14 Din pair.

6ft
180lbs
50% park/50% All mountain. *Hit most jumps, but not too many rails.
Pretty aggressive, but not an expert yet.
Unfortunately, only get to hit the slopes about 10 days per year so long term durability is not much of an issue.
Gonna be mounted on '07/'08 El Reys. * I know not the best things out there, but for the amount of time I get to ski, they will make do.

Also, If anyone wants to direct me to a good sale on either of these, post it up.

Thanks.