I'd recommend the SillCrylic cases by Incipio
Cases and Accessories - SILICRYLIC Silicone Crystal Case for BlackBerry Storm 9530 - White
The cool thing is that they're two cases, a softer rubber case and a harder plastic case. The rubber one can be used by itself if you like. Used together they're very low profile, still very much pocket sized, and the screen protector is exceptional. You can read a thread started on these forums here:
http://www.blackberryforums.com/hard...ylic-case.html
And despite earlier problems I had which you can read about in the thread, Incipio customer service were great and response time was very minimal. I am very happy with the case(s) and definitely recommend it or maybe something else from their site.
EDIT- Also note that you can get the case in colors other than white.