I highly recommend the InvisibleShield (http://www.invisibleshield.com), especially if you're already cautious about not dropping your iPod and get sick of using an actual case. I'm really careful with mine, so I don't need to get a bulky case. I just have a little pouch I put it in.
Here are pictures I took of my iPod for an older thread:


But anyway, I like that first clear case, but it seems like it'd be hard to use the click wheel