PLEASE HELP!!!! i habe 8GB which is plenty for me. unless u plan to put a lot a lot of videos, movies, and shows, etc, etc on there than a 8GB is fine. or if u think ur gonna get an ipod touch or iphone or sumthing new in the future than ull probly wanna go with the 8GB. its quite a bit of memory. enuf for me at least. :-)
good luck!