As my ole' 80 gig Classic is on it's last legs with a half hour battery life, failing hard drive, and random pauses when playing through the headphone port so I'm starting to look at other options for on the go music. Anyhow I'm looking at getting a 16GB 5th gen Nano and am just wondering how reliable those things are. Whats the average video and radio life on them? Any stories of them being dropped or in someone's pocket during a marathon? How scratch resistant is the screen? Thanks.