Are there a lot of engineers or programmers in amsterdam? Web designers, or marketing people? I think that is the kind of infrastructure we need.
Amsterdam would be a very nice choice in many ways, and living in the country to save on costs would be a reasonable compromise.
Their residency permit requirements are reasonable as well.
I didn't think of Berlin as being cheap. Will have to look into that. Berlin is very appealing for a number of reasons as well.