You definitely cannot go wrong with Otterbox. The Defender cases are inexpensive, and Otterbox has a warranty protection guaranteed should there be any issues with the case itself. They will send you a replacement for as long as you have issues. I've used Otterbox since the beginning of my iPhone life.
Otterbox has different types of cases that fit your wants and price range. Also they have different colors.
As for Amazon, you want to make sure the listing says "Ships from and sold by Amazon.com." From what I'm seeing, you save money from buying from them. I am unsure on any warranty. I purchase my Otterbox cases from their website, Otterbox.com. They will send you replacements for life as long as there is a noticeable issue.