Similar question for this one [What are some awesome card programs with zero forex fee? [Non USA]], I just have to ask it in the German specific thread. I understand DKB is the general favorite here (though its program is not so great) but its forex fees render its (anyways inferior) program useless for accumulating points by shopping abroad.

Any German option for acquiring some good points as well while shopping overseas?

There is also a [US] thread about Valuation of points and miles - FlyerTalk Forums