My current rig has a 1TB internal HDD with my OS installed on it and a 2TB internal that I just got for media storage. My massive anime collection has to go somewhere. I also have a 1TB external that was previously housing my anime collection, but is now going to be recommissioned as a back-up drive.
Additionally I'm looking into getting myself a 128GB SSD some time after Christmas to install my OS on, but that will only happen if there are some good deals.