I've tried them all now it seems like. I've installed most Open Source CMS's and other platforms. Some platforms I instantly stop and bail early. Others I stick with. The main ones that I have worked the most with are Drupal, Joomla, WordPress, and sNews. Since I can do everything with Drupal I choose to just do it all with it now. I have my modules I always install also. I'll be putting together a list soon so you can see the ones that I recommend by default when installing. I loved WordPress but found for what I was doing it was much easier to use Drupal with much less effort.