Multi-Level Pay To Blog users

I would like to have 2 levels of paid blog users;

1 Basic
2 Premium

I would also like 'Premium' users to be able to set-up additional blogs (each to be paid for).

Assuming 'Pay To Blog' only has a single user level, would it be best if I used 'Supporter' for the 'Premium' package?

Further more I will add the 'Affiliate' addon so anyone can be an affiliate.

Thanks for any suggestions or comments.

Martin