This is why I don't buy those that cost an arm and a leg. Just think the iPhone 5 has been out for over a year. At some point those first run of cases will show up on sale. I know I found an Otterbox 4s case at Target for $10. I saw the Otterbox 5 for $15. Incase, Speck, Belkin you can find at a good price.
I went with getting an iLoome screen shield and a Spigen Ultra Hybrid case. So far it looks nice. Not a lot of wear because I'm good at keep my cases looking nice. I did one time replace my iPod case because it was worn. But after using it for two years I think I got my monies worth ($10).
The best warrantee that I've heard was Otterbox and Lifeproof.