Heya,
I think that would be an interesting topic. As for originality - I don't think it's too unoriginal, you'll just have to find an original niche inside the topic. For example, maybe compare East German vs Soviet sources. I think an exploration as to how East Germans were culturally and ideologically different from the occupying forces would be interesting.
Perhaps a bigger picture would also be good - something like how Germany reacted to the reunification. At the time, did the East Germans say that Germany should reunify? Did they think it would happen? If yes and yes, why did it only happen as part of the USSR's fall? Two answers would be that firstly, the Germans were pragmatically incapable of ruling themselves, and secondly, were ideologically incapable. There's been a lot of discussion about how the WW2 is an eternal guilt for modern Germans - did they even want to empower themselves?
Unfortunately, I'm not very well educated on the subject, but I don't think there are many debates in terms of historicity. Issues like propaganda and other sources would be awesome, though. Put it this way: West Germany was occupied by three major world powers, and East Germany by one - all of whom directly fought the Germans in the war. The official state sources are thus going to differ hugely, especially when we consider that none of the occupying forces were culturally similar to the Germans. Maybe you could compare East and West social (as in social history) sources? Something like an Annales School approach would be perfect.