Has anyone seen any heavy duty cases other than the Otterbox Defender? I take classes in a machine shop and have a job doing maintenance at a gas station, so I need a case with plenty of protection. I've heard talk of the seidio convert but have yet to see one pop up. Also watching Trident closely. Anyone have any suggestions of places to look? i would get a Defender, but I haven't seen one in store yet and want to get my hands on one before buying.