Membership & Pro Sites

Hello, I wish to make my register page like the current edublogs.org signup page; but I have been thinking of a possible way to link the signup process together with Membership plugin and haven't come up with a solution yet. I want the user to be able to select their subscription options, enter their registration information at the next page and finally choose their domain.mysite.org at the other page. All I can see now when using the Membership plugin is only registration page; there isn't a domain.mysite.org registration in the process. Is there a plugin that connect the Pro Sites with Membership packages together that affect the signup process?

Haha, I just hope my question is not too difficult to understand.

Thanks.

Bro. Louis.