I'm not sure if you calculated this in your debt estimates, but just to throw it out there, cost of living in Pittsburgh is WAY below what it is in DC. You'll likely pay at least 2x as much in rent in DC (even if you live in the burbs, like VA or MD, which is kind of a drag), and transportation costs are likely to be significantly higher as well (I don't know if GWU offers transportation subsidies, but I know in Pittsburgh the city buses are free with a university ID). As someone who is currently living in DC and moving to Pittsburgh in the fall to start at Heinz, I'm blown away by how much lower my costs are going to be in Pittsburgh than in DC.
Just food for thought--might mitigate some of the difference in debt calculations!