Archive Subscription plugin

Can anyone suggest a plugin that will allow me to make my blog subscription based. I don’t know if I am wording it right so I will explain briefly.

I have a site that is a journal. I would like to make it so that people can see the teaser, but they would need to sign up and login in-order to read the rest of the journal article. It would be nice if I could ask for donations when signing up, or even charge a price for a subscription. For now I think it will be free. But I’d like to have the option if possible.

I want to be able to track who is signing up instead of having it open to everyone as it is now.

Thanks.