Congrats on the funding to SIS. I have also been accepted to the SIS international politics program, but alas no funding. SIS is definitely under heavy consideration for me though. My pros is its location in D.C., which gives you a chance to intern, build a network in D.C., and get a degree all at the same time. Besides that it seems to be a pretty respected name among employers, at least in D.C., and although the living in D.C. is expensive it is offset by the school's relatively low tuition.
Cons, the school doesn't seem as academically focused as say a Denver, but unless you're hell bent on going for phd or going to a think tank eventually I guess it doesn't matter. I'm not sure if that's entirely accurate, that's just the impression I get. Also I'm a little underwhelmed by the resources and job statistics available through the SIS website, especially compared to it's closest rival, GWU. I guess in that sense SIS is sort of an enigma to me, but there's time to contact the admissions office and obtain that information I suppose. Bottom line, I'm still waiting to hear back from the Elliott School on Friday, but if it's a no go I will probably end up choosing SIS.