Expert Advice Needed - Which WP Membership to use (See Details)

We need to know which wp plugin to use and how to use : We will be creating data management individual site for our clients and each we be charging $300 set up fee and a monthly fee of $55 We will create for each client individual subdomain site for their data management under our domain eg. client 1 - [login to view URL] client 2 - [login to view URL] client 3 - [login to view URL] We want a) a membership plugin to collect the set up fee and monthly fee via paypal. b) Any month failed payment, client will no be able to login to use the site c) main site : [login to view URL] is an introduction page to be readable by all public - not to be blocked by login We tried s2member@framework plugin and install at [login to view URL] thinking it can control the subdomain - but it blocks thie main introduction page instead. We hope to have a login page controlling numerous subdomain behind\ You may skype with us when advising us