Topbar is either normal site links or totally magellan links dependent on the menu setting. This was one of the main use cases that prompted me to write MagicGellan.
There are lots of ways that you can combine the two for instance this page has a TopBar and a sticky MagicGellan http://demo.bigwhiteduck.com/magicgellan/markers/ although it could be fixed directly below the Topbar so that it appears as one bar.
You could also have a vertical Magellan with a TopBar. This page has a vertical MagicGellan for wider browser sizes transforming to dots for narrower screens. There is not TopBar on the page but it would work fin with one http://demo.bigwhiteduck.com/sections/layers/
Another choice would be to use the Joey stack to place MagicGellan inside TopBar and optionally allow it to appear and disappear when the page is scrolled. This page shows it in action although it contains a standard magellan (MagicGellan did not exist when I did the page) which requires some CSS to work. MagicGellan in static mode can be dropped into Joey without modification and will work out of the box. http://demo.bigwhiteduck.com/ButtonPlus/Examples/
These are just a few suggestions, lots more possibilities exist and people have done some very creative things with the combination of TopBar and MagicGellan. I hope they give you some ideas.