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px12, a lot of heel elasticity with less weight, less money and less DIn than an fks.
having your bindings properly adjusted is important too, its amazing how many park skiers bring their shit in with broken brakes and then when im fixing it they have almost no forward pressure, if you dont know what your doing dont adjust your bindings.
Budget? Look PX12 (/Rossi Axial2) are have a great quality-price ratio.
The Look Pivot (/Rossi FKS) is a safer binding, really popular. Could be a worthy investment as far as knees are concerned.
From Marker, the Griffon is a good option as the guy up there said.
With skis getting cheaper, bindings are a good thing to put money into.
FKS / Pivot are no safer than the Griffon or STH. The only binding that promotes and has proven to reduce knee injuries is the knee binding. You choose FKS for its delta, small foot print, and elasticity not its safety.