As you are planning for more updates it would be good to keep in mind the following datatypes in SQL Server are no longer in use/recommended, and/or will be depreciated.
- datetime
- smalldatetime
- ntext
- text
- image
In fact, replacing all ntext with nvarchar(MAX) will yield a smaller faster database in most cases.
http://msdn.microsoft.com/en-us/library/ms187993.aspx
http://msdn.microsoft.com/en-us/library/ms187819.aspx