5x abyss, collapsed prison, scaffold execution ground.
also BOD (Bonds of Darkness)... BOD gives best exp and u have/will have quests there. For 50's there are repeats so spam repeats with a good party, turn in other quests when you're stuck. The King Coll tooth quest has a horrible drop rate, so don't rely on that one too much (I think that's the repeat for level 52). I think 51 was 80 weakend ogres and 53 is 20 or 25 vivis and 100 vamp bats (look on FF Wiki for the quest list).
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