I would go with the 80G. That's what I have and I have 8 games, about 500 songs, a few game trailer movies (maybe 8 or so) about 9 demos that stay on there and I still have PLENTY of room. The only game I have that takes up uber space is Gran Turismo 5 Prologue. But, even at that, I'm still ooooozing with room. I don't plan on downloading any movies on mine and the music is because some games allow you to play your music while playing the game...like Xbox did...30 YEARS AGO!!! ;-) 80 should be good unless you're super hardcore out the box.