I also downgraded from the Otterbox Defender to the Commuter. Much easier to get in and out of pocket. Also dropped it in my garage last night and no damage at all. Commuter seems to be a great durable case.
I bought a NUDE brand case from the Apple shop and then when i opened it I realised it was some really **** polycarbonate thing plastic casing and was quite disappointed.
Opting for a silicone one now but not sure if it will insulate heat if the iPhone heats up? :S