Elliott ! of course. Since you are going to work in international organizations like WB or UN, staying DC will definitely give you much more chances for internship and also lower the living cost during intern. Nothing else is more important than intern opportunities. Do not overestimate the prestige of Ivy of Cipa. GWU is definitely treated as a good university in american society. Have a look at the notable alumnus of GWU and you will find it is of great prestige in political fields.