Johnny - It sucks that you're having so much trouble with your iPhone. As a rule the refurb iPhones are as good as new ones. Please keep us informed as your adventure continues.
As an aside, I'm guessing you went to the store on Chenal. I've never been there. How is it?
Johnny - After I upgraded to an iPhone 6s this past summer I opted for the Spigen Neo Hybrid case which really slims my phone down so I can carry it in my jeans pocket now. It doesn't have much drop or impact protection and the screen is completely unprotected but I love it and can't see going...
At work we use Griffin Survivor cases on our iPad Airs. It's not a screen protector, per se, but an overall protective shell much like a lifeproof or otterbox case. It adds considerable bulk but protects well against drops and falls.