Paid member plugin with some specific features [closed]

Question

I was wondering if anyone knew of a paid membership plugin that streamlined the peyment/registration process into a single step.

Ideally there would be a signup page. This page would have the typical fields (email address, possibly a user name and password) as well as the paypal button (only active when all required fields are filled). I want the new user to be able to enter their info, then go straight to paypal to pay, then upon payment confirmation (via IPN) the plugin would create the user ID and send a confirmation link to the email address entered.

The biggest problem I had with the plugins I tried (S2Memeber, Members) was the fact that users had to first create an account, then subsequently purchase a membership. It was causing a lot of confusion, very few users actually went through the whole process without emailing the site for help. Many thought there was a problem when the account creation page had no payment options and emailed for support. I can try to work around it by offering more instructions on the account registration page, but ideally I'd like to consolidate these two steps into a single process.

The plugin doesn't need to manage content restrictions, I can handle that myself. All I want is an automated system for user/payment management that will automatically demote users when there subscription lapses or payment fails.