wingrider01 provided an excellent link. I personally have the OtterBox Impact Series case on my Captivate, which is the third one on the page.
It has saved my phone twice from getting scuffed up due to two accidental drops on a concrete sidewalk and driveway. The Captivate has a Gorilla Glass screen anyway, so it likely would not crack or shatter like iPhone screens do. I'm not saying that the screen is indestructible, but it's certainly more developed and stronger than the ones on iPhones are.