I'm using this case right now. Amazon.com: Black APEX Hybrid Hard Case Gel Cover For Samsung Galaxy S2 (Epic 4G Touch D710) Sprint: Cell Phones & Accessories
In the picture it looks really thick but it really isn't at all (this coming from someone who hates using cases). This is the same case but in pink (if that's what floats your boat
) but you can see the design better in the pictures for this one. Amazon.com: Pink APEX Hard Case Gel Cover For Samsung Galaxy S2 (Epic 4G Touch D710) Sprint: Cell Phones & Accessories
edit: I forgot to add that this case is 2 pieces (kind of like otterbox but much much thinner). The inside is a silicone piece and on the outside is a plastic backing that you put on after to hold it in place. I would say the thickness in general is comparable to that of a silicone case.