Which Auth Plugin is best for me?

[eluser]Kemik[/eluser]
Hello all,

I'm looking for an auth plugin which I can customise to suit my needs. The features I'm looking for include:

- User registeration with activation email
- User login with remember me button
- Forgotten email link
- Some form of ACL (e.g. an example of an admin/user only page).

Any suggestions would be appreciated.