damn man you must have like zero muscle cause those bindings arent that heavy.
as for the px15, they're solid. If it is relevant for you... well, it depends more on your ability and stuff, but your size certainly might warrant them.
what do you put your DIN at usually, what is your ability level, what is your BSL? Those are also important. What type of skiing do you do. That is a great binding, but if you usually ski your DIN at 8 or less then the PX12 Jib is fine for you.