paid listing

i am maknig a site, where people can pay to put there company listing on. There is 2 modes, free and paied. I am instrested in a script for this?

i know a possible meathod.

get the paid subscritopn mod to put a user into a group. and then they can submit 1 link to the link mod. and edit the link mod to show some more advanced stuff..

any one know a better way?