I think I have decided that I am going to get this: (or the BodyGuardz due to the fact that this won't be available until after the iPhone's release)
For Scratch Protection
And some fun colored (thin) silicone skin for drop protection.
The reason I am getting the Full Body Film is because every iPod I have had in a hard or soft case has scratched while in the case. Some have scratched as I pulled them out to dock (due to the design) and all of them have scratched because a little sand/dirt made its way inside the case and rubbed around making the iPod look like there wasn't a case on to begin with.