Drupal will do what you need - and without any extensions, as this functionality is in the 'core'. Alternatively, you can copy/clone most CMSs by duplicating the database (MySql for example) and the website.

TypoIII is a freight train - same momentum and design curves
MT is hackable and flexible with loads of skins.
Drupal is superior in many ways. Although Joomla is great also, it has not got multisites in the core.

HTH