Honestly, the Apple iPad case was great for me, and it did a great job protecting my iPad before I sold it. It's one of the cheaper cases, it's thin, and it can act as a stand for typing or for watching movies. I never dropped it, so I don't know how much it would protect it.
The only problem with it was that it was a dust magnet.
http://store.apple.com/us/product/MC361ZM/B