There is a wide range of CMS‘s available for use. Some of them are free like Joomla, WebGUI, Bricolage, Mambo and some of them are commercial ones like Bitrix, Drupal, etc. Joomla notably stands out from the other CMS‘s thanks to its quality and usability.
When it comes to the high-priced website developers, they are going to have a reputation to back them. They are going to have a portfolio of professional websites they have created that are going to speak for their work. High-priced website designers are going to have people who could vouch for them as well as have a very strong web presence. This is the reason why they are going to be priced so expensively, because what you are really paying for is a degree of certainty, not necessarily superior quality.