I understand, but no hidden charges .... Dropbox or otherwise.... unless of course you choose the larger storage Dropbox option (I don't) but that has nothing to do with d2g..... You get 2 gig free storage with Dropbox, and that is a lot of Word docs
Just a free tip, If you plan to do a lot of editing, you will regret getting Pages. Many try pages and then get d2g because Pages just cannot keep the formatting straight... good luck...