Hello,
My bid is for a classifieds site. I'm not sure what a business card directory is. Maybe you could elaborate a little.
Also, please specify exactly what kind of classifieds you need. Maybe some example sites. Classifieds sites range from the very simple to utterly complicated, depending mainly if you want each category with it's own set of fields , if you want to filter the results, and if you need a login system/how complex.
For a list of sites I made, please check the PMB.