When I snowboard I usually bring my MP3 player with me. Now that I have the iphone all my music is on that. I would like to sell my old MP3 player, but before i do that I need to find a case that will completely protect my iphone in case of high impact crash or whatever else. It can be a completely enclosed case or whatever, just needs to be ultra protective. It will sit in my jacket pocket near my chest (inside pocket)... any suggestions?