if you are Australian, Behemoth is a good place to roll, even if your not, the FC i am in is really helpful, and i'm always willing to help someone run a dungeon or whatever if your in need of a tank or healer, also willing to provide help to aspiring tanks or healers as well

Tonberry is a good realm, but near impossible to roll on given it's so popular, i tried to when i recently returned to FFXIV myself.