I currently just bought an iPod Classic (120GB). Now, that is enough storage space for me, and I can put enough videos and music on it to keep me occuppied for the day. I know that running/jogging with a HD based iPod isn't supposed to be good for it. My question is...is it worth investing in a Nano or iPod Touch for the purpose of exercising with it? My birthday is tomorrow and I was thinking about treating myself. Opinions?