It sound promising and you might actually get this InterServer Standard plan if you need a lot of storage. But please pay attention that even if they say is UNLIMITED is not actually like that.

You are still limited to 400.000 inodes (the total number of files you can host) and you get only 20% resources (CPU and Memory) server resources – which is quite low. But again for storage, e-mail or any other applications that are not processing resources hungry, you can get this InterServer Unlimited Hosting for sure!