Just to elaborate on what I said earlier, I'm not a case type of person. Usually they either add a ton of bulk or take away from the aesthetics of the device. The Griffin Reveal hits at both of issues. The fact that the back of the case is clear is nice (helps if you have it engraved or just like the back of the iPod). Plus, it's just really thin but gives the device great protection. I dropped mine face down in my house by accident...the device was totally protected without a scratch.
The only downside is the price, but that seems to be the case with most of these cases. It comes with a neat stand that you can use for video watching or just to keep the device on in general around the house or in the office.
As for screen protectors, I haven't needed one for mine. I keep it in my pocket, and I don't have any markings on it. Whatever Apple uses for the screen, I like it.