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