If your website is of dynamic nature and the content on your website is going to increase day by day then the task of CMS can be the crucial one. So while choosing the CMS for your website you should take extra precautions. In my opinion the best CMS is Joomla due to its security and safety.
No one has mentioned Dreamweaver. Is Dreamweaver considered a CMS or is it something else?
Dreamweaver is a development application. It can be used to write the markup and code for your website. A Content Management System is (as it's title suggests) a system that enables users to publish, edit and modify content from an administration area without having to modify the existing code on the site.