the look pivot series and rosi fks series both offer a lateral release system.
these are great for people with knee concerns, now you said you dont need a high din binding so the metal 18 dins are out of the way, however i ride at a 10-11, and i much prefer having the metal 18 din over the plastic 14.
the sth is also a good line of binding, i would only consider the driver toe though, since that is what people rave about them.