I like this for the following:
Bola shot with thunder ball is an aoe, builds hatred, and is a good go-to skill for the stun. I used this for my solo diablo run, and it worked well, cause my DH is quite a bit fragile.
Multishot Fire at Will is ownage, and with vengeance passive, I can spam 6 clicks of it before hatred is gone. At crits of 1100 plus and avg white dmg of 500-600 (these numbers arent accurate, just estimates, i think I have about 880 dps at the moment in my character screen), this is my favorite aoe skill. My favorite toon to this day is a 1.09 zon with a windy and tons of IAS spamming multishot, so this is a nostalgia to me. I also think it does mad dmg. It might not be the most efficient though. I am in Act 1 NM and walking through multiple groups of mobs.
Caltrops I am so used to now that I almost cant live without them, and I have just unlocked the dmg rune for them, so it seems to me like a no brainer.
Cluster Arrow I LOVE. I use it for champ groups and single target dmg. It seems to really drop big DPS, as long as the cluster bombs hit the target too. This works will when the mob is stunned (bola/thunder ball) or slowed (caltrops.) If they aren't at least slowed or otherwise occupied (perhaps beating on the barb or monk) the cluster bombs really seem to miss quite a bit. When they do all hit, Cluster bomb feels like a ton of dps.
Vault is essential for me. I use it all the time. I am so stacked with dex that without vault, I would be dead A LOT. Especially noticeable in act 4 and NM act 1. Things just start to hit harder and elite groups have more modifiers. All the sudden I am getting one or two shotted if i dont vault away in time. This was also essential for my solo diablo kill. He was fast and has a wide range of attack, so without vault I would have been smacked down hard.
Shadow power I use as an 'emergency' button. Having a way to restore life when you are on pot cool down and there are no health orbs got pretty important to me. My DPS/max health ratio is high/low so I can go from near death to alive within the three secs this is alloted to me, especially if I am using an aoe.
I have swapped out skills quite a bit and tried a lot of things.
I would like to figure out if Multishot is worth it. People are saying that elemental arrow is beast. I used a ton of chakrams earlier on for AOE and loved them as well. I switched to multishot/Fire At will the second I could cause of nostalgia mostly, but I am loving it. Is it worth it? With Fire at will the hatred costs is diminished, but it might not be enough.
In regards to single target, it seems that impale/chemical burn would be best at my level, but I really think well used cluster arrow out performs it quite a bit. The problem is cluster bomb is expensive. 50 hatred per attack is rough.