Some more progress:
- changed the transparent bar texture, thus creating a less flat hp look
- thinner tooltip and minimap border
- tooltip healthbar moved inside of tooltip and added an extra line for health value
- changed font ... again
- added border around unitframe auras
Not sure about font choice. I want to go with a serif, because I think it fits best, even though I hate them.
Not quite satisfied with the border around auras, yet. But maybe it's just me.
E: added another image, showing tweaked aura icons