Do you remember the name of the German internet shop?
It was "www.my-solution.de". I'm afraid they don't have the same variety they once had. Have a look though.
I would suggest to also take a look at "www.thomann.de". They have a very good deal on the DT 990 which is the high end model. Better that the DT 770 and the older DT 880. They list the DT 990 at 145 Euros which is a bargain. The DT 990 is open type with unbelievable sound (at least to my ears).
You are recommeding the open type, but the DT 770 Pro belongs to the closed type. Is that nevertheless of good quality? And if I may ask you again, is yours of 80 Ohm or 250 Ohm?
The DT 770 Pro is closed type but is an exception. It sounds open enough. Bear in mind though that closed headphones tend to be firmer in the head than the open types. This means that after some hours of use, they may feel quite uncomfortable.
No, I don't have the DT 770, my mistake if I said so. I have the DT 880 (older model) which is semi-open at 250 Ohm. But today, I would prefer the DT 770 Pro at 250 Ohm over the DT 880.