A good Duty Finder set is, imo:

Provoke - obvious use.
Rampart - obvious use.
Anticipation - the short CD makes it really good for dungeons, specially when paired with Awareness.
Awareness - see above, though it can also be paired with Bulwark so it has a double use.
Convalescence/Reprisal - I personally have Reprisal, but Conval is a good tool for dungeons too, specially if you have a SCH as your healer. With a WHM and AST you have to use Conval before the pull starts so that their regens will get the full effect, but SCH can make use if it no matter the timing.

For harder content, it will heavily vary from fight to fight, specially at lvl 60, once PLD and DRK get their OT shields, which might make it so Rampart isn't absolutely needed.