I'd go with the majority of comments. Wordpress is perfect for a simple website that has lots of pages and news and a calendar. Quick and easy out the box, great templates and lots of suppliers to assist.
However if this is the client who is likely to want to add custom functionality - a complex application that needs a database, I think that Drupal is the best CMS ever. It is particularly suited to Intranets that have new functionality requirements all the time and you need flexibility. However Drupal is currently going through a major version change and if you need your site right now a lot of the modules are in a state of flux.
If building a complex site is something you might do regularly, wait 3 months and then have a look at Drupal 7. It's not something you want to implement quickly, but it's a great product. Now that I know it, I would use it even for a simple site.