all the look/rossi consumer bindings (so px12, px14, axial2 120, axial2 140s, etc) have the multi directional toe (no other binding really has that release, except for the intermediate look/rossi bindings, which are no good for your purpose). They can release on a backward-twisting fall. Others can too, but they dont have the same rotation that the look/rossis have.
The racestocks are meant to keep racers (and i guess hard pushing freeskiers) locked in with more stability in very strenuous situations, while releasing when it is necessary. Like I said before, the multi-directional toe is nice, but if so many riders with say rossignol, dynastar, atomic, armada, etc. use the racestocks, then it really shouldn't be an issue.
However, if you really dont need them (and im inferring that you really dont), you would be fine with just a consumer binding. If p18s are the most economical option, and you do ride fairly hard, then they wouldnt be a bad choice.