(x-posted in Baby Bargains car seat forum)

My options are the Traditions, Generations, or Chase (I'm trying to find the cushy version in Canada, but so far have only found the uncushy version).

DS is 37" tall, 36lbs, has very thick thighs (in the older model Evenflo combo booster we have, his thighs always have red welts on them after longer than a few minutes).