Rampart and Provoke are the two must-haves in my opinion.

From there Reprisal and Convalescence are applicable in basically any encounter.

Finally, I switch between Anticipation for Dungeons and Shirk for 8-man content.

If an encounter requires a Stun or Silence, I'd check if I can replace Anticipation or Shirk, otherwise I would likely replace Convalescence with them. If there is an auto-crit phase like Diablos in Dun Scaith, I'd throw likely swap Convalescence with Awareness if I need Shirk; otherwise, I'd run it as my fifth Role Action.