Hello.
I'm from Germany and can't understand why you're only searching for headphones "Made in Germany".
The sound is all what counts for me.
My only headphones "Made in Germany" at the moment are the HD800. They are astonishing, but look at their price...
I had DT880 and DT990 before. They were "Made in Germany", too, but I didn't like them. I prefer HD600/650.
You'll rarely find good sounding headphones "Made in Germany" beneath 500 USD.
DT880/600 -for example- is no match for HD800. HD800 blows them away in every aspect.
I even own the little Alessandro headphones, "Made in USA", their build quality is sh*t, but they sound good for hard rock music.
Okay, HD800 sounds even better there... :)
I wouldn't ask for where the headphones are made, but how they sound. That's the most important thing to me.