Hi, I just got a nano and was wondering what is the best case for it (generally under $30, and preferably under $15)? I'd like to protect the screen from scratches. The back too if possible? What brand and is it a hard case or soft one? Would you also get a screen protector (I'm thinking more of the static cling based ones such as ClearTouch, Podshield, etc rather than ShieldZone ones- water makes me nervous).