I agree. Though I haven't done all the job quests (I don't even have MNK or BRD, lol) the deeply personal and introspective nature of the DRK 30-50 and 60-70 lines make them standouts as far as job quests go, or even quests in general. They actually explore the cost of our heroism... and by that I don't mean the people we fight and kill.

The climactic fights are suitably epic as well. Especially the 70 one; I think it might be one of if not the most epic solo player instanced fight in the game right now.