I've been enjoying this build:
Bola Shot / Thunder Ball - For lone elites when trash and minions are dead
Multishot / Suppression Fire - For trash and minions, refills discipline for Punishment
Shadow Power / Gloom - Use before dumping hatred
Preparation / Punishment - Refills hatred to feed Multishot
Vault / Trail of Cinders - For travel and positioning
Companion / Bat - Refills hatred to feed Multishot
Perfectionist - Defense, reduces cost of Punishment
Archery - Improves crit chance of Nightstalker (for one-handers)
Nightstalker - Refills discipline for Punishment
Upon encountering a mob, hit Shadow Power.
Dump your hatred with Multishot.
Refill hatred with Punishment.
Dump more hatred with Multishot.
Use Vault to reposition if needed.
Repeat as needed.
For this build, I recommend at least two pieces of discipline gear so that you have enough for Shadow Power, Punishment, and even a Vault. Three pieces allows you to use Punishment more liberally.
When most of the minions and trash are dead, you should switch over to Thunder Ball (or your favorite Hatred Generator), because there won't be enough mobs for Suppression Fire to recover the cost of Punishment.
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