TRADING WEBSITE + FEEDBACK SYSTEM

I am a freelance programmer myself with just not enough time on my hands to code my own part time projects. Basically what I am after is a website which will allow users of my facebook group to sign up, trade among each other their old unwanted items and allow to leave each other feedback to reflect how the trade worked out. I anticipate this site being more than just a regional fixture so therefore there must be functionality to join group or only see posts within your region or within a region / distance filter which can be set by the user (or by admin). The website should be snappy, low bandwidth and fresh design. It should include at least the following : BASIC FUNCTIONALITY - User registration - Feedback system for transactions that have been completed - A credit system which will be used by users to bump there posts - A purchase credits system which will allow users to by credits to access premium features - Preferably a chat but at least the ability for users to be able to mail each other (may be premium account restricted) and for admins to be able to contact user via their registered email address. - A ban / suspend functionality in place for admin / moderators to access. - Certain access restrictions for moderators / members to prevent misuse of power - Room for advertisements on ALL pages - MUST have paypal functionality to accept payment for credits purchased by the members. - IMPORTANT All pages must have the ability to see a message of the day posted by the admin team. This should be near the top of every page and be very prominent. MAIN PAGE - NOT LOGGED IN - Main page with banner and navigation links - SIGN IN or REGISTER box - PURCHASE CREDITS box - Quick preview of recently posted items (perhaps 5?) - Slightly larger preview of admin endorsed products for swap/sale which can be selected by admins and changed easily (perhaps 3?) near the top of the page MEMBERS AREA - MAIN PAGE (LOGGED IN) - This should be the page that members are then directed to (but MAIN page with the deals must still be accessible) upon logging in which will give them an overview of their posts and responses to their posts. - A large portion of this page should show all the posts that have been posted by other members most recently (preferably with the ability to expand the viewable number of recently posted items 10, 20, 50) - Access to the feedback system for any trades they have completed DEALS OF THE WEEK - A page where all the top deals and locations of such deals can be posted (these deals must be able to be selected by admin and if admin have not selected anything, should automatically populate itself with the most recent posts by PREMIUM members) CHAT - A place for our users to chat. Whether it be jIRC or some other form of freely sourced chat software UPDATES - A page to tell users of members who have recently joined and important notifications from admin listed here. I have a million ideas for the site and this site will require work in the future also so the successful candidate(s) will be used in the future to upgrade and add more functionality as and when the sites requires it.