When I went to a site that lists and compares CMS programs, I was overwhelmed by at least 100 listings. Again, I would like to rely on personal experience. What I am seeking is a CMS that will provide users at my client (a Yacht Club) to update news items, and if possible, update a calendar using a Web based editor. Not a full fledged portal CMS.
Whatever you do, do not use PHP-Nuke or PostNuke. They are popular and they seem good at the beginning, but you will regret using them after a while. (Their internal design is not thought-through.)