Plugin Recommendation Request: Memberships / Subscriptions

Hi everyone,

I’m looking for a membership plugin that will integrate with my existing wordpress install. This plugin will need to be very versatile and flexible, and it would be nice if there was a strong aspect of support or community support. I have tried Magic Members and s2Member, but neither have provided the features that I need, or the support necessary to make modifications.

This is currently what I’m looking for:

* Subscriptions that do not work on a set time frame.
* Ability to create and delete subscriptions using hooks:

If the user clicks this button and pays, create a subscription.
If a database variable is true, expire their subscription.

* Subscriptions that tie a user account to specific posts:

User #2 has access to posts #3, #7, #9.
User #3 has access to posts #2, #5, #9.

Using hooks:

User #2 presses button 15. User now has access to post #15.
* Drip-feed support upon access:

User has access to post #1. Post #1 is available. User is provided access to #6. Seven days later, #6 becomes available (cron?)

I realize that these are pretty complex requirements, and I have thought of designing my own plugin, however, I would like to get this done as soon as possible. I am willing to look at purchaseable plugins, as long as I can test them out before I make an investment.

Thank you for your help and your time.