Auction site (unique reverse and Dutch auction)

We are looking for a company able to develop a site as inspired by these: [login to view URL] [login to view URL] Following above site´s structures, key points are: Lowest unique bid / scratch auction (Dutch tulip auctions) with automatic redirectioning to the partner´s website though the opening of a new page if needed with a "buy now with discount" option. We do NOT want one of the kiddy scripts floating around on the web with some modifications done to it, aestetic and practicity will be very importante (from the customer POV as well as the site administration side). Front End layout will provided as much as e-mails lay-out, sites´s architecture will have to adapte itself to the layout. However I would appreciate cotations with and without layout design. Giving special attention on SEO and SEM optimization. Development on open source, HTML, PHP. Browser compatibility with Internet Explorer from 7, Mozilla Firefox from 3, Safari from 4, Google Chrome, Opera from 9.6. Administration back end must be easy to use with multiple automatic operations. The site/script will need to have a powerful administration area that is completely user friendly, ability to upload product details/ pictures and control all aspects of the site. All the codes and files MUST NOT BE ENCRYPTED, so we could make changes and modifications in the future if needed. Installation of any language and ability to specify different delivery prices for different countries. Product category menu bar across the top as a normal e-commerce site. Full statistical information on clients accounts and necessity to enable export statistic informations on spreadsheets files. Mobile devices compatible (Iphone and other mobile device) - additional version of the website, compatible with small screens of mobile phones ans PDAs. Advanced mass e-mail management (e-mail in HTML format and linked with customer registration form and bid history) + statistics. Affiliates solution (e-mail in HTML format and win bids...), tip a friend. News and recent winners section. RSS feed. Facebook, Twitter and Orkut integration to allow automatically to send to this social network information about auction started/ finished/ news published/ promotion. Online chat module between auction site and customers(not between customers). Different bid cost possibility depending on item. Different time auction possibility depending on item. Limit on the number of auctions a user can play in a period. PayPal online payment gateway together with credit cards payment and additional online payment channel provided specifically. Must be delivered, installed with a bug free warrantly. Installation and a minimum of one year of technical support must be included in your proposition as well. Please send projects that could show us your skills and habilities in developing the real kind of site we are looking for and not a copy of usual auction scripts that we could easily find on the net.