Looking for user registration plugin with PayPal

I’m looking for a plugin that will allow me to take registration for users on a WordPress site but also bill that user for membership.

I looked into a plugin called S2Member and found that it’s a bit overkill for what I need. I simply need a way for a user to be able to create an account, be billed for it, and be allowed to post on the site.

Any ideas on a plugin that can do this? I don’t need anything overly complicated, I just need something simple to handle user payment, creation, and registration.