I really like my Symmetry protective cover for my Galaxy S4. It's pretty, fairly slim (not bulky), and the rubber sides make it nice to grip plus it bounces if I do happen to drop it. The only downside is no protective cover for the screen - so it is possible the screen may break if it lands on a pointy object or the corner of something. Generally the sides of the cover come up and over the screen just enough to prevent the screen from hitting the floor if it is dropped.
Pros: High quality, Durable, nice rubber on sides to grip, nice design