I'm only applying to 2 straight IR programs: SFS and Fletcher. Although I'm interested in subjects that would generally be classified under the IR-wing (or economics), I sought out a variety of degrees and found that MPP programs quite often have my desired mix between quant and theory. Many even allow you to specialize in development, and from what I can gather, offer a little more financial aid than most IR programs. Unfortunately, it still isn't much. That said, I'm applying to Fletcher, SFS, Chicago Harris, Carnegie Mellon Heinz, Princeton WWS, and Harvard KSG. If I don't get a good chunk of my studies funded, I'm probably not going. (So maybe I won't be going to graduate school next year!) Since I'm interested in a dev career, it's just not feasible to have a large debt load.
If I go to SFS I would concentrate in International Development. I think it's a wise move to apply to just MSFS if it's the only school that strikes your fancy. I'm not convinced these degrees have a huge return on investment, so it's better to be prudent and do something you know you want to be doing.