I JUST got my new iphone 3G. Upgraded from a 2G finally and i love it, but i am SOOO concerned about cracking the back!!! I was wondering if having a GOOD skin on it would be enough. Now, i have never flung the phone across the street, but i have had it drop out of my hoodie pocket on occasion. So i wasn HOPING there was a way to get away without a case. I am TOTALLY ok with a skin though.. are there skins that are a little thickers or tougher than the other?? I know the front screen protector that i want (the mirror one from switch easy) but i dont know about the back skin.