Replying to Binding help

About me: 5'7, 150lbs. Intermediate park skier. East coast.
Just bought a pair of AR7s. Looking for the right bindings now.

I know very little about bindings. From the binding sticky I think Im around the 10-12 din range. I do want some room to advance once i get better and go bigger.I would really like to spend around $150-250 max $300.

Also I really the bindings that have the heel pivot. I'm willing to spend the money for a safer very binding. Is it really worth it?

Thanks for the help guys/gals.