Trust me, use the iPod sock. You can get one on eBay for like $8. I had to order from the UK to get an official Apple one, but it was worth it. I tried one of the others and it wasn't very good.
The touch screen is very resilient. The only thing you will need to keep protected is the shiny metal back, and the sock does that very well. Cases tend to trap dirt between the iPod and the case, and cause deep pitting, such as what happened to my 4th generation iPod.
Just trust me on this, get the sock.
PS: It's really not a good idea to bump your posts, especially on a topic that has been asked time and time again. Think of these forums as a database of knowledge, and search it for your answers.