I am planning to start a new forum for local people in my city to buy and sell mobile phones i want following functionalities: - itrader system (the way we have here on DP) - [Want] or [Selling] title of thread compulsory to choose one. - classified/ auction site.. i think vbulletin will be my best choice.. but i have few doubts: - do i need to buy additional software/module to have above said functionality? What i don't want - payment system like paypal etc (the site would be free to use list want it now and selling options)