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Office2 HD was a dark horse for me last year and was one of the cheapest options that was also one of the best in terms of functionality. As you can see here you can secure your documents and manage how they appear and are shared.
New presentations are also supported in Office2 HD. The left hand side is also where you manage your files and access them for editing.
Office2 HD provides an experience that is a cross between Quickoffice and Documents To Go with easy tabs at the bottom and menu option icons at the top. The icons are a bit small and everything is in black and white though.