classified page

We have have a classified page system already written in PHP. We like the set up and the management tools that are built into it. What we would like someone to do is take the exisiting code and modify it slightly. Currently a use can click on a category, fill in the information they want to post. All of the listings then appear on a single page for that category. What we would like to be able to do is have the pages appear more like CraigsList in that say 100 headlines appear, then a user would click the link and that listing then appears on its own page. It does not appear that it would be too difficult to do this, since the data base, the admin and much of the code are already written. Prefer U.S. bidders so it is easier to communicate. Possibility for additiinal work in the future if we are satisfied.