If you are stuck on that much space, that is a pretty good deal. I think there are some better options if you might need more space long term though.
What I would do if I was planning on needing a lot of space is get a NAS or Windows Home Server. Especially if you would like to have some form of redundancy, in the form of RAID.
Even a dual enclosure like
this would work, and it has a few raid options as well.
For a cheaper option, with some more flexibility:
dual hard drive dock, which would allow you to have a large drive, say 2TB for your main storage and the ability to swap in extra hard drives for stuff you don't need access to all the time. Even if you didn't want the ability to swap out drives, pick up 2 x
2TB drives for $89 each or 2 x
1.5TB drives for $79 each, and then HDD Dock, is $245 for 4TB storage or $225 for 3TB.