I need your opinion on what is the best CMS script/platform that is suitable for a school/university website.
What ever CMS you choose just keep in mind that it should be open source like Plone. You should also take a look at PHP-Fusion. The new version 7 is almost just out, so there is not as many infusions and themes as for version 6 – however the forum supports are excellent and version 7 infusions and themes will grow in numbers you can of cause also make your own infusions/themes to make a really unique site and it is free to use also.
I have recently studied an article from EnterpriseWizard that might clarify you further.