Developer needed for Downloadable products selling market

Hi there, Need a developer who can develop or get us the website which has mainly undergiven features: 1- Many people or companies can signup as sellers or buyers or affiliattes on the site. 2- sellers may be able to sell their downloadable products/upload pictures, specifications for products.... Have their profiles on site etc. 3- there must be admin panels for the sellers, buyers and one main for the complete site for Administrator to manage/change/edit/check everything on the site. 4- site must be good seo friendly and each page on the site must be monitizedable with ads/banners etc. also each page must have the addthis or facebook,twitter, stumbleupon, digg etc. buttons to add the pages to social networking accounts. 5- Categories for the products on the site. As an example, please check: [login to view URL] [login to view URL] [login to view URL] [login to view URL] any like these. Looking forward for the very best lowest BID offer with the lowest time-frame to complete and submit such site on out hosting account (for our domain name name). Bid with your very best lowest offer and time frame for this task so we may consider and accept the winner for this Project. NO TIME WASTERS PLEASE, EVERYTHING IS TOLD IN THIS DESCRIPTION, SO IF YOU CAN WORK THEN BID ONLY. Will milestone the amount which will be only released when the task is completed, otherwise negative feedback and dispute for funds will be made. Thank you and happy bidding.