I know some people need the full functionality of MS Office Suite, but have you looked at Open Office, which is free?
http://www.openoffice.org/
One of the first things I did upon getting my MBA was set about researching how to get all of my business applications up and going on my Mac so I could take my work home with me (I've a Windows machine at work). I didn't want ANY issues with countability of files, etc.
I installed Open Office to tide me over until I could get a copy of MS Office. 8 months later, I'm drafting proposals and doing spreadsheet quotes in Open Office, opening and editing .doc and .xls files in the evening that I started work on my Windows machine during the day.
It just turns out that I don't need MS Office. Open Office lets you save your docs as MS files etc.
Anyway, it's just a thought. May turn out to be all you need, and save you some $$$