I know you edited the post to say you got a 'good enough'. I'll still explain what we do
The top right of our site is using the SCLogin module. We've set it to display a Modal popup when the Login button is clicked and we've configured the module to use text links, instead of buttons. That's all that's necessary to show the login area up there.
When a user is logged in, the SCLogin is still showed. There's an option in the Logout section for showing a "User Menu". With that, you can choose to show any Joomla menu you've configured on your site. We do have some additional styles specific to this site, but it's not crazy styles that we couldn't help you with if you had some questions.
So, in general, nothing special up there.. just the SCLogin module. We realize there are a lot of options in the module, which can make it hard to find the configuration that may work best for you.
If you have any questions or general feedback, just let us know!
Thanks,
Alex