[support] Different registration for different roles with different fields

I need to let user register with different roles. Roles are Companies, Freelances, Regular users. I found Profile role <http://drupal.org/project/profile_role> module but I guess is not what I need.. I'd need something that let me chose which kind of role I want apply for and thend, filling the right fields (I have different fields for every kind of Companies/Freelance/Regular users) do you have any idea? thanks