Good day!
As for me, I am professional Web Developer and co-owner of a web-development team with 17 years experience in Website Development. We can build highly Professional Website of any complexity.
We work with content management solutions (Drupal, Joomla, WordPress), e-commerce shopping carts, credit card integrations, mail applications, mySQL databases, CGI/PHP/Perl scripts.
Since you require multifunctional site I recommend to use PHP for development.
See http://www.thebusinessplace.com. This is one of our best PHP projects. The Business Place is an online matchmaking service connecting investors looking to buy a business and vendors trying to sell a business, as well as brokers, banks, venture capital firms and other business suppliers.
Technologies: LAMP (Linux, Apache, MySQL, PHP5), Zend Framework, OOP, MVC, SVN, SQL, xHTML, CSS, JavaScript, DOM, XML, AJAX.
The rest of our projects you can see in our featured portfolio.
Let’s discuss details during a brief conversation. Have a nice day!