I happen to like the Marine Park/Kensington/Flatbush communities since they are English speaking, not insular, and still very frum, convenient, and full of opportunities to learn.
The Flatbush Jewish Journal, for instance, lists opportunities to learn under R’ Aryeh Ralbag, R’ Hershel Schachter, R’ Eli Baruch Shulman, Rav Belsky, Rav Nelkenbaum, and other heilige gedolim, whether for iyun, daf yomi, or other shiurim.