Login/Registration Plugin???

I’m looking for a plugin that will disable the viewing of posts for unregistered/not-logged-in users.

In other words: when a user clicks the “read more” link, one of three things happen:
(1) if the user is registered, but not logged in, s/he is sent to the registration/login page; or
(2) if the user is not registered, s/he is sent to the register page; or
(3) if the user is registered and already logged in, s/he can see the rest of the post.

What I’m looking for is a way to have only registered – and logged in – users be able to read the remainder of the post.

Any thoughts/ideas?