I have selected Joomla CMS for my site, but in general I am a CMS newbie. It seems one can spend a lot of time testing various components for his CMS. It seems to me that app provided by Joomla-Builder.Com does the job, but I am still thinking.

So here is the question: is there any site where I can get Joomla or any other CMS (Drupal, WordPress) with pre-install components?
It's a question of saving time.