ipod nano accessories What other accessories are important to have when purchasing an iPod Nano? Planning on purchasing an iPod nano 8GB. This one: http://www.bestbuy.com/site/olspage.jsp?skuId=8771901&type=product&id=1204332006560 What other accessories are important to get that are not included. I see it comes with a Dock adaptor is the dock something I need to purchase separate. iTunes gift [...]