postaroo.com redevelopment in php

[login to view URL] is a classified ads website very similar to craigslist. The site has been developed in JSP compiled code and we would like to redevelop it using PHP. Current database structure is MySQL which we'd like to keep. Backend programing and database architecure must have the capacity to handle millions of listings. New website should incorporate current functionality of [login to view URL], as well as support additional features specified in the attached documents. Core New Features Include: - Rewards / Points system where users will attain points for posting ads which in return give them better odds at winning prizes and giveaways. - Membership system where users have control over their posts and can view point status. - Administrative Area where listings, users, and various other aspects of the site can be controlled. *Only serious bidders please. We are only interested in developers who have developed complex sites similar to postaroo.com. All bidders must provide references and examples of previous work.