Union does not make a cost effective all mountain binding. To get anything actually stiff enough you have to get either Chargers or MC's.
Get SF45's. Or for other optoins, Flow NX2-AT's, Burton Cartel, K2 Company, or Salomon Hologram.
Go ahead, drink that kool-aid.
FS: Forum Sauce 142 $200 plus shipping
FS: Flux SE30 $75 plus shipping