Limiting members in a blog using Pro-Sites

Hi, I was going through the features of Pro-Site, I would like to restrict the number of users based on the Pro-Site level.

i.e. Free - 25 Members
Level 1 - 200 Members
Level 2 - 1000 Members
Level 3 - 5000 Members
Level 4 - 10000 Members

Can this be done with Pro-Sites or any other plugin in the WPMU Dev library of plugins?

Thanks, Best Regards,
Santosh