Been rocking the Otterbox Commuter series and couldn't be happier. Used it on my iP5 and now 5S, It does add slight amount of weight but also adds a comfortable amount of width to the device. I have also had near drop moments many times and it has definitely protected my iP5 and 5S from shattering and/or getting dented.
I like to keep my devices in mint/brand new condition because resale to me is very very important as I like to upgrade yearly. The amount of care I put into my iPhones while using them to the fullest extent is always appreciated by the second hand buyer as well.
I do not purchase AppleCare+ because I purchase my devices at full price [no contracts] and look at expenses over 2yr/24months rather than just today [if you all really think about it, it adds up quick] and adding AppleCare+ at $99 + $79 for replacements + $849 + Taxes makes you really think about where you want to spend your money and how careful you want to be.
And when it comes time to resell, you'll be lucky if the case/ceaseless difference covers the cost of the case.