Can you guys help me out here? I can't run with my 20 gig 4gen ipod and would like a 4gig nano. I don't have any cash and was thinking of selling my ipod on ebay, but would rather not. Do you think a trade with a used 4gig nano and my ipod would be fair? I'd hate to see all that space go though, however I only have about 7 gigs of music. I think I can spare some.. what do you think?