I am looking to develop a ppc advertising portal for a multivendor marketplace, so vendors can log on and chose to advertise products on the homepage of the site (Similar to amazon) or choose a promoted listing (similar to ebay) they should need to compete for the advertising space and the highest bidder wins the best spots, when their budjet is exhausted then the next highest bidder with gain the top spot. these adverts will be shown on the home page and also the product search pages, with options for website headers and footers for costs.
i would like this to also link to google adwords if possible. so the vendor gains from 2 types of advertising for a single cost/click.
Please send me options and solutions for this.