Cases - some people love them, others hate them. Regardless of how you feel about them, there is one truth: they're useful and help keep your device in top condition. A quick look through eBay or Craigslist will prove the value of keeping your gear in a case - when trying to sell a device most users put "has been in a case since day one" or something similar (whether it's true or not). That assures the buyer that they are getting a near-mint condition piece of kit.
When it comes to top-notch device protection, one name often comes to mind: Otterbox.