1.
Official Apple Case
2. Great case. Provides sturdy typing and portrait modes. Can collect dust, but that can be wiped off. I would like something stronger if I took my iPad on a trip... maybe just stick the apple case inside a bigger case/container.
3. Don't have the dock, but can charge.
4. Not sure... maybe a
Medge case. I have one for my Kindle DX and it provides excellent protection. I would prefer a case that folds for typing though.