Comparison Shopping Website

I'm looking to build a Price Comparison Shopping website Functions are as follows: ----------------------------------------------------------------------------------------------------------------------------------------------- * Sellers will create an account with the website * Sellers will input details about their products. * A Customer visit the website * Customer will register/create an account with the website. * Customer requests a search for a product based on a set of criteria/features The database will return a list of products which match the search criteria, the price and name of sellers. * Customer will shortlist the vendors (tick/select one or multiple products from the list) An email will be sent to the shortlisted vendors wil the contact details of the customer. ----------------------------------------------------------------------------------------------------------------------------------------------- Details of the product and features for this website will be revealed. But please note the product concerned has some complexity and therefore will require a bit of work on the database side. Majority of the design on the db has been done but it may needs to be reconfigured. Either asp.net or php would be ok. *IMPORTANT* Please quote reference "Orica" in your bidding reply so I know you're not a bot! Thanks.