Probably Shin Megami Tensei III: Nocturne's version of the Press Turn system. P3 and its brethren kind of dumb it down too much and removed the defensive game it develops into. The battle system takes elements from popular TCG games like Magic The Gathering where building a defensive based party can actually take you farther than the usual RPG Blitzkrieg style offense favored in most games of the genre. In terms of a modern JRPG that actually requires tactical thinking and long term strategy, it's easily the best in the genre of turn-based battle systems.