For those of you who are always in search for the best source of information, this ranking might be of interest - reached through the CGD comment on the index, think-tank I usually follow. As could be foreseen, most of the organizations are from the States, with very impressive budgets.
From this part of the world, the first place is for the Chinese Academy of Social Sciences, the second for the Japan Institute of International Affairs, the third for the Institute for Defence Studies and Analyses (India), the fourth to the Indonesian Centre for Strategic and International Studies , and the fifth goes for the Japanese Institute for International Policy Studies . Unfortunately, no furthe info about their budgets or their impact is provided. Also, some of these web pages seem to have been updated for the last time a while ago. Something that makes me hesitate about the classification methodology is that Dr. Pachauri group, TERI, winner of 2007 Nobel price, appears only until the 11th position. But, anyway, it is a good start for your research endeavors.