I have a 1GB Sony, works very well.
I put everything on it, and don't worry about space. Pics of the kid, power point presentations, word/excel stuff from work, misc vids. It's nice (to me) to know that I have a TON of room.
I still will email everything to myself about once a week as a backup to my backup.
(Obsess much?)
P.S. Yes, get the extension cord if you need it, it's on my list to get, but DEFINATELY consider it. Look at the USB ports on your system where you will use it (may be more than one; home, office, etc.,) it may be a necessity.