i have pretty much every type of binding made. most bindings weigh about the same. but my newest pair are the rossi pro 180's (the ones tanner/boyd/julien/philou) use. they heavier then the p12's but not by much.
binding weight doesnt effect ur skiing all that much. because ur binding if right under your feet. it would matter more if ur skis weighed a lot because generally ur tip would weigh more then ur tail. aka swing weight.
so dont not buy a binding because u think its heavy, cuz it doesnt matter all that much.
Phree Stylez