Marker M11's use the old Biometric toe piece which is prone to premature release cuz it releases all spring tension once tourque is reached. long story short, put too much torque on it landing a spin and out ya go. thats why they switched to the new Royal Fam series of bindings. No one likes premature release.
I've always liked rossi and salomon, and in my experience i find salomons are easier to get into if you are say, hiking in soft snow and cant put as much pressure on the heel when youre stepping in. sometimes with look/rossi/dynastar bindings you have to lift the heel peice up to help yourself int them.
look for sales. ebay can be sketch, especially with bindings. these are your knees we're talking about. PX12 or Salomon STH 14driver are good choices.