Car Selling Portal

Hi, I need a portal like [login to view URL] or else, where people can subscribe and post to sell their old vehicles, search for new one and contact the owners by the internal msg or with direct email (phone). So u can imagine all features this portal needs. Admin panel, photo gallery for each listing, custom fields etc. More info for who's interested. Thnx for the time .... and please only professional and with good english.