I fear greatly for my reputation ( :-{ ) ) so preface this un-Perlish observation that I mention it because #1_Son swears by Joomla... a free, open source content management system written with PHP... and speaks well of Drupal ... written in PHP. (cites: wikipedia).

On another hand (there are many, here), having resorted to exploring CMSes for a client, I reached the conclusion that most of the folk to whom the client wanted to hand commit bits should not even have been trusted with fingers to turn on their computers. IOW, I am more than just a bit leary of CMS but since you will control who has access, YMMV.