I want to invest into cases for my iphone 4 and ipad 1. I need something that protects real well. Thus far I'm looking at otterbox defender series. Minuses I've read in review about those is that case itself will scratch device, gotta put something in between there, and they heavy and bulky. I want something for maximum protection, like dropping the damn thing. I've already dropped my iphone on concrete, minor scratches, works, but not prestine. What other cases I should look at?