Apple iPod Nano 2nd Gen JAVOShield- Metal Case (with screen protector), 1 Silver+ 1 Gun Metal
I was going through cases every month until I came upon these JAVOShield metal cases.  The ultimate protection for your iPod.  The inside is even lined and it comes with a screen and click-wheel adhesive (removable) cover as well.  The aircraft aluminum also does not add much weight to your iPod. I'd buy these again but I don't think I will have to since they are so sturdy!