How much does it really cost to live in Arlington, VA?

I lead a cheap life. I make a good living, I live in Toledo, Ohio. I am fielding job offers at roughly 75k a year, which with as low if a cost of living as this city is, is not a bad living at all. A head hunter called me today and asked me what my salary requirements would be for Arlington, VA. I don’t trust cost of livings calculators… it said it is around 80% more expensive to live in Arlington. I don’t mind living in suburbs or whatever… What should I do to come up with a number for the head hunter?