I'm still on the fence between case and caseless. I know I'll be selling my 6 Plus next year. So good condition will help for resale. At the same time, both options are expensive as there are no cases available here that aren't Apple, and Amazon imports all end up costing $20+ in shipping alone. And they add bulk to an already chunky phone. AppleCare is something like $150. Ehhh...
AppleCare's $100 for a 2-year 2-incident plan. It's not too bad, and my experiences with Apple customer service has always been nothing short of phenomenal. If it helps, I currently have the black leather iPhone 6 case made by Apple, and I love it. It's very slimming, feels good in the hand, and it looks especially aesthetically pleasing. I recommend it if you want to shell out the extra $50.
AppleCare has always been worth it to me. I dropped my iphone 4 running and had a hairline crack on the screen. I brought it to the apple store fully expecting to pay the 70 dollars or so for the new phone and the guy from the genius bar just handed me a new phone for free and said that hairline cracks in the screen were fully covered with AppleCare. Sometimes I think that Apple's customer service even outweighs their products.
Apple's customer service is absolutely phenomenal. I've taken my iPhone 4 in for a hairline scratch, as well as a battery replacement for my 13" MacBook Pro (2010), and both times I was expecting to pay some sort of price out of pocket and wait a considerable amount of time for repairs.
At the time, my iPhone 4 was covered by AppleCare and my MacBook was not, however I received a brand-new iPhone 4 for no cost and they replaced my battery in my MacBook for free as well, and I had to wait maybe a half hour in the store for each service. Absolutely wonderful experience. The Geniuses even chilled with me (I was by myself both times) just to keep me company while my products were being serviced. They're great. Apple really, really cares about customer experience.