Need some input from iPod owners here. I'm looking to get an iPod - mentioned possibly getting a Shuffle before, but based on what I would use it for, is it the best one for me? Storage isn't an issue - I only listen to a few songs obsessively for awhile, delete them, and move onto new ones. I'd probably listen to it most while doing something like walking my dog, studying, or lying in bed. Giving the Nano's scratch problems, would it get crappy quickly? Or would the smaller, less-scratch-prone Shuffle be best?