Viral Competition Website Needed

Greetings, I need a web software created that allows users to invites a user's friends from Facebook, Twitter, Hotmail. Gmail, Yahoo, and other popular email accounts and online address books to takea desired action e.g. : . join a competition, . like a Facebook page . or subscribe to a service. The software must generate a unique referral url which users can post to their Facebook or Twitter and then can see through a leader board how many potential people could sign up and how many have signed up or taken the desired action. Examples of what I am trying to achieve can be seen here: [login to view URL] [login to view URL] MAKE SURE YOU SIGN UP AT BOTH THE SITES AND GO THROUGH THE WHOLE PROCESS OF INVITING USERS THROUGH FACEBOOK, TWITTER, GMAIL, YAHOO ETC SO THAT YOU UNDERSTAND THE WHOLE PROCESS. THANKS It should have a backend admin page where the admin can set up different parameters such as: . the header and the footer banner should be changeable . The body copy where we detail the competition, the prizes etc . style sheet customizable interface. No big issue, but a write-able custom css over-ride would be good. The site users (front-end users) should have the ability to, for example: . refer three friends - get xx, . refer 10 friends and get xxxx chances ..etc etc Apart from that, the framework can be the same as the Kogan methodology. For each invitee to the competition, the referrer gets another competition entry. All data should be saved in a database and an interface should be provided to view this data by admin and by the user. a. private viewing by us (i.e. the administrator), where we see all data available. referrers, email addresses etc b. public viewing where competition entrants (the user) can see how many people they have invited, a leader board of people who have invited the most, the number of entries they have etc. c. this data should be downloadable in .csv format We will provide the design (in the form of psds, .jpegs, .pngs etc, buttons and banners etc); you will have to integrate it into the site. We will hold the exclusive rights to this site and you will not be permitted to resell or reuse any parts of the code on future projects. Let me know if you are using a from-the-scratch solution or something like Joomla etc for the development. I would prefer that its a from-the-scratch solution. Please use the word green in your bid so that I know you have read the requirements in details. Please provide estimate of time and cost. This project was being done for 400 USD by another developer but he had to stop working because of a problem so I know the approximate budget of this project. Hence please bid wisely. The chosen developer will also have more chances of getting work in future.