Car Search Bot / Widget

Looking for an expert in online search technology and search database management. We are building a widget for a Wordpress website. The widget (or plugin) will be a search bot for the car industry. Websites to be searched: AutoTrader, [login to view URL], [login to view URL], Craigs List. We also want the ability to add other websites in the future. - One entry box for user - User inputs car choice in single box - List page is displayed from all searched websites - Websites to be searched: AutoTrader, [login to view URL], [login to view URL], Craigs List - List page has link back to detail page of respective websites - Optimize search database - Must display results quickly! Payment in escrow only. Feedback in this technology is important.