Which CMS system (or something else entirely) would you recommend for small to medium websites and respective businesses/organizations?

Idea is to host a server and run several sites off it, each one of which designable, editable and maintainable by the respective folks, all without much or any technical knowledge and desire of coding. Nothing too fancy required, mainly text content and pictures/videos, perhaps some mail contact forms and basic stuff like that, but nothing crazy like a huge webshop or the like.
The back-end Linux server itself would be taken care of by competent SysAdmin.

What are the best options here to get people going either from scratch or importing existing sites and take it from there? Which CMS and server setup would you recommend with a good Benefit to PITA ratio? ;-)

Appreciate your replies already...

#question #cms #webhosting #server #website #wordpress #joomla #drupal