Wordpress would be a good choice. Its pretty easy to extent compared to Joomla and drupal. I strongly suggest avoiding Joomla. Don't reinvent the wheel there ar

Wordpress would be a good choice. Its pretty easy to extent compared to Joomla and drupal. I strongly suggest avoiding Joomla. Don't reinvent the wheel there are hundreds of CMS out there, find one that meets your needs which in this case sounds like Wordpress.