I was not planning to weigh in again since I am only a prospective applicant, but as a layperson, but I disagree with the notion that columbia has only a slightly better reputation than jhu. fairly or not, US schools are judged on the basis of their undergrad reputation, and in that field, JHU is not considered in the same tier as ivy league schools.
this is not to say it is not an awesome, awesome school, but only to say that the "brand" difference between jhu and columbia is more than marginal. to the lay person.
as for "people in [his] field" -- it doesn't sound like he is planning to go into anything in the international relations field, and, having worked in the idev field abroad, no name except for harvard turns heads. (as a side note, this is annoying because misinformed people assume they know the US and its schools becuase it is a country they have a lot of exposure to even if they haven't been there...)
that being said, i have no idea how the private sector would view an IR MA vs. an MBA or an econ degree...or the fact that salaries in germany, tend to be lower than those in the US (reflecting the lower cost of living there) -- so that 60k may or may not be important to the OP depending on other personal financial factors.
interesting point about better jobs -- without the prerequisite work experience for a given job, though, will an MA just get you into high-powered jobs? would be curious...