Reverse Auction site

We are looking for a reverse auction website. In a typical reverse auction site buyers post his requirement for any item & based on the description the registered seller post their prices. Once buyer is satisfied with the specs. They select seller/s. there are several sites in the market but we want best matching algorithm to meet the requirement of buyers & sellers. It should suggest real time matching options for any posting. We will also provide matching algorithm concept. I would also like to know if you can suggest some more features to make it unique from the other sites in the market. We initially want it to be free for both buyers/ sellers. Please send me your proposal with Technologies you recommend. If you have similar previous experience then please includes the URL with your proposal. Thanks ## Deliverables 1) Complete and fully-functional working program(s) in executable form as well as complete source code of all work done. 2) Deliverables must be in ready-to-run condition, as follows (depending on the nature of the deliverables): a) For web sites or other server-side deliverables intended to only ever exist in one place in the Buyer's environment--Deliverables must be installed by the Seller in ready-to-run condition in the Buyer's environment. b) For all others including desktop software or software the buyer intends to distribute: A software installation package that will install the software in ready-to-run condition on the platform(s) specified in this bid request. 3) All deliverables will be considered "work made for hire" under U.S. Copyright law. Buyer will receive exclusive and complete copyrights to all work purchased. (No GPL, GNU, 3rd party components, etc. unless all copyright ramifications are explained AND AGREED TO by the buyer on the site per the coder's Seller Legal Agreement). ## Platform LAMP OR .NET/MsSQL With heavy use of AJAX in both cases Cross browser friendly/ Web 2.0 look