The aluminum ones seem like a pretty good solution for those that have a history of dropping their phones. I know there's a few different places that carry them that I've seen them at (online that is). Thats about the most protective case I can imagine really. The leather ones, while offering some protection, aren't going to make a whole lot of difference if you drop it I wouldn't think.... If the old one just slipped out of your hand, check out eGrips--I love these things!