I've got the Logitech keyboard case by Zagg. It does not give 2 sided protection or have stylus storage. As far as being a keyboard goes, I like it. I usually only use it when I know I'll want the keyboard as it's design isn't the most convenient for things like reading on the train or taking notes with the stylus (iPad doesn't really connect to keyboard).
The mobile device guru at my company uses the Zaggfolio. If I was buying over again I'd probably get it. Still no stylus storage.
You can check them both out
here.
Re: styli in general, I'm currently using the
Kuel H10 which is the best I've found for handwriting with the iPad. It's got a lanyard on the cap with a little plug that fits into the headphone jack...a pretty clever design that I really like, but I'm pretty sure I'm going to end up breaking the plastic plug off in the jack at some point.