Thanks for the replies, all. Very much appreciated to hear thoughts from each of you who have more experience with the cities/fields than myself. SIPA has given me until this Friday to put down a deposit, so time is definitely on my mind.
As was pointed out, it's a question of which school offers the better value. I'm unsure if economic development in Asia is where my heart lies or if economic development in general is the most interesting route, which is really the crux of my dilemma. SIPA would carry me farther outside of Asia, but IR/PS obviously has the regional edge.
djd-
My background isn't incredible by any means, but it's done me all right with getting into programs.
My undergrad was done at a small, private college in IL w/a biology major (GPA 3.26). After I graduated, I lived/worked in Japan through the JET program as an English teacher at a part-time high school for "troubled kids" for 3 years. Learned Japanese, enlightened young minds. Since I've come back, I've been working at a university and have taken a few econ classes. My GRE came in at 1340 (740Q, 600V), and I've had a random, but pretty consistent, spattering of volunteer work with non-profits and political campaigns throughout.
I applied to 3 IR schools (SIPA, UCSD, and Washington U's Jackson School of International Studies) and got into the two I'm stuck between. UCSD was the last of the 3 I applied to (SIPA, the first) and since I thought my applications/statements of purpose got stronger as I went through them, I was really stoked/surprised to hear I got into SIPA when I did.