Thanks for posting your requirement.
We understand that you want to develop a website on same theme of themeforest.com.
We feel confident that we are the right-fit for your project because we excel in Graphic design, Drupal,Wordpress, PHP/MySQL, PHP5, JavaScript, XML,XHTML/CSS, Joomla.
As a next step, We request you to please initiate the private message board through freelancer so that we can discuss on the requirements and give you a firm cost/ timeline.
Best regards,
Dean D Andrea