I think the question's perspective isn't the best. However, if it's really your goal, try a program with a dedicated research track in the match or, barring that, an informal one advertised on their website. In general, geography is going to make you a lot happier though. The ultimate point of residency is not research, after all. If you want to focus on research excluding all else, focus instead on research TOPICS. Look at various faculty research topics. Some kind of global extremely well funded university is not going to help you if none of the stuff being done interests you.