[CharlieO]

I depends how you want to save your games, wether you save separately at every stage or just overwrite data every time. If you don't mind overwriting then more space wouldn't be as important.

And also wether you are just going to use it for games or also store movies/music on there.
Oh and if you are more likely to buy disk games then you wouldn't need as much space compared to if you buy games on the online store.