Problem with Custom Member Fields and 2 different kinds of users

Hi,

We are using EE2 to create a big website which will have 2 different kind of users, “Standard” and “Premium”. Premium profiles will have the same fields as Standard, with additional ones. The problem is that we can’t do this with Custom member fields as it doesn’t allow us to use fields as wysiwyg, checkboxes or files for example.

In your opinion, what is the best way to do this ?