Provoke is obvious, it's a must have. That's solid.
I macro'd Convalescence and Mantra together so it's essentially a 25% boost every time (they share the same CD).
Flash is pretty useless for Warriors imo. Infuriate + Berserk + Steel Cyclone = all the flashes and then some.
Then next ones I use are Internal Release (because it works well with Wrath stacks) and Second Wind (because WAR self-healing adds up over time and it's a decent amount).

Awareness is great for large pulls where you're likely to take a few crits (Brayflox etc.) and I guess you could pop it when you know a big hit is coming and the possibility of it critting would kill you (Death Sentence!!). Anyway, yeah. That's my take at least.