My opinion is just put a full body zagg or bse or bodyguardz on the phone and maybe throw it in a pouch.
Whats the point in a rubber or plastic case that will cover the sleekness of the phone ? How often do you actually drop your phone ? I never dropped any phone before knock on wood, because i know that i have to be careful with it. SO a full zagg or bse etc would be enough protection if you want to put it in your pocket.