Classifieds board.

it should be easy for people who know what are they doing. I need a classifieds board for auto parts with ebay- like item pages. search by zip code should be included. 2 types of accounts (seller and buyer). Buyers should be able to send messages to sellers right from the website. Adding listings to buyer's Favorites should be included too. Sellers account. here is the part where some programing should be used. In order to post an ad, seller should have points on his account. 1 point- 1 ad. There will be a few plans for sellers. it all should be controlled from admin panel. When somebody is registering sellers account, there will be field for promotional code for those who have one. Promotional codes will be added from admin panel. One promotional code can be used only once. Person/business who has promotional code gets certain ammount of points (controlled from admin panel) for free. Also, admin should be able to add points for some users from admin panel. Billing should be connected to paypal. Some nulled script can be used. I don't mind at all. i'd, actually even perfer that. If there will be some interesting functions- leave it there :) Installing and customizing script is a 2 hour job. I know that because i'm creating websites myself. so, all i need is that billing system created and integrated into some classifieds script+ a couple of these little things i've described above. i'm also gonna need design integrated, once it's done (i'll send psd file).