Inheritance and forms


I have two user models - PrivateUser and CorporateUser - in my Rails 1.2 application. Both are subclasses of User, created by restful_authentication, which defines a user which can log in to my application.

Now, I want to let both types of users register. They will need different forms to fill out, but the logic is similar. So the use case is

- User clicks Register link - User chooses account type - User fills out form - User clicks Register to submit form

In the rest of the application, the two types of users are not very similar - they have different roles and should get different views, actions etc.

I am looking for the best way to keep my registration DRY - is there something smart I can do here, or should I just make two completely separate controllers whose code for 'new' just happen to be very similar?