Otterbox
I am new to iPhone. I converted from Android after seeing the awesome new specs the 4s offered.
I recently purchased a white and blue Otterbox Commuter for my 4s. What I love about Otterbox is the sense of security (pretty pricey investment a phone is) but at the same time it offers a sense of style. The Blue on white on white is very very sexy.
I love the Commuter because it doesn't have the bulk, but still offers superior protection. The silicone cover may just be good enough, but the hard plastic shell the fits VERY snugly over the silicone takes it a step further.
I have used many cases in the past, but I am now officially an Otterbox fan.
Oh yeah, and the Commuter has the round cutout in the back so everyone can see that Apple