Buy and Sell Businesses

Hello, This project is for a website that buys and sells businesses. Here are some examples... [login to view URL] [login to view URL] ## Deliverables I need an engine similar to that with limited functionality. The functions needed are the following... Login for Customer to post ADs, Manage their ADs and contact potential buyers or sellers. Ad Management system that will have mini statistics on every spot for the client to see the progress of the ad on their side. Administrative back end for the owner to approve the ADs once submitted by the customer. Promo Code availability. Secure e-mail system like Craig's List. Sellers see buyers and buyers see sellers. Happy bidding, please impress me :) ## Platform I need this in Windows Environment.