What you should be aware of is that MS Works 9.0 now allows you to open Word and Excel .doc and .xls files and also allows you to save documents and spreadsheets in those formats. So why do you need to spend an extra €90 when you have all the software you need bundled with your PC? The answer, in most cases, is you don't unless you need advanced features like macros and pivot tables.
So before you rush out to buy Office give Works a run around the block. It may be all that you need. And if you do need more horsepower in your office productivity software, there is always OpenOffice.