The Problem:Despite rampant price drops across the Software Industry, Microsoft wants to charge you more for Office. They are trying to force you into a subscription model.
Microsoft: Buy Office 365, Not Office 2013. Or You'll Be Sorry
Why Office 365 and Office 2013 may not be right for you
Big changes in Office 2013 and Office 365 test Microsoft customers' loyalty
Microsoft ties Office 2013 to a single PC
Four reasons you don't need the new Microsoft Office
No matter what you might think at the moment...
YOU DO NOT HAVE TO HAVE MICROSOFT OFFICE.
There are viable alternatives available.
Google Docs: the collaboration features are fantastic. Take a look at this video and this one on sharing/collaboration.
LibreOffice is the most popular alternative to Microsoft Office. It is free, you don't have to pay anything to use this. It works on Windows, MacOS and Linux.
LibreOffice 4.0: First Take
LibreOffice 4: A new, better open-source office suite
LibreOffice 4.0 New Features and Fixes
You may also wish to check out: AbiWord, Gnumeric, OpenOffice, Calligra, Kingsoft
If you have needs that are more like desktop publishing you might want to check out Scribus.
Helpful Article for what to do/not do when switching from Office:
Triumph and disaster: Two migrations to OpenOffice
Microsoft attempting to sow Fear, Uncertainty and Doubt about leaving Office:
Microsoft won't release study that challenged success of Munich's Linux migration