My guess is that most apps will be smaller than typical mp3's, some much smaller. Small apps will be smaller than tunes, and big apps will be smaller than movies.
So basically you have to decide if you want a big music collection or movies on your iPhone. If you want to watch feature length movies, then maybe a 16 GB will be more appropriate. If not 8 GB should last awhile.
So basically you have to decide if you want a big music collection or movies on your iPhone. If you want to watch feature length movies, then maybe a 16 GB will be more appropriate. If not 8 GB should last awhile.