After responses from a previous post, I've decided to buy a HBB for my daughter in my husband's car. It will always be used in the center seat... how important is side impact protection in this position? I am looking at either an Evenflo Big Kid Sport or a Graco TB. The TB definitely has bigger head wings, but I just wonder how necessary they are in the middle. I doubt she will ever sleep in this seat since she really only rides in there going to school in the morning. Also, she is tall and lean -- does one of these seats tend to fit skinnier children better?