Best business directory software?

[RSK3000]

I'm looking for an easy to use business directory software as an add on to an existing Wordpress powered site.

Needs to allow free and premium listing options.

Cheap/ Free would be best. Also needs to be easy to configure.

Any suggestions???

 

[ddwebguru]

Please do not rely on these software because they are associated with a number of flaws and therefore can mark negative impact on your SEO campaign.