it will be used with a USB port and only used by one person. for now, lets ignore the external usb case and go with one with a built in hardrive. any recomendations?
"Best," without information on how it will be used, is highly subjective. For simple bulk storage, if it were me I would buy an external USB case and put a big (320GB-500GB) drive in it.
Do you have an eSATA port? Do you need to provide multi-user access to this drive?