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PX12 / Axial2 120 is pretty much the king of the budget 12(/13) DIN bindings. Probably the heaviest too but that's somewhat down to it being the burliest. STH12/FFG12 is a close second. STH12 Driver costs a bit more but is worth the upgrade for the good toepiece. Third place goes to the Griffon. Dark horse award belongs to the Tyrolia/Head 12 DIN jobbie as some people reckon it's the goods while others I've spoken to reckon it's pre-release city.
Marker 12 Free/Marker 120 or whatever they call it is suitable for intermediate groomer skiers and not a lot more, in my opinion.