This is something I came up with focusing on slowing enemies as much as possibe then using the runed version of Impale to hit targets in a straight line.
Primary - Entangling Shot with Chain Gang Rune to start things off with the slowing theme.
Secondary - Impale with Overpenetration Rune, Impale attack.. only better
Defensive - Caltrops with Hooked Spines Rune, 80% slow to affected targets in the area, giving you plenty of time to line up Impale piercing attacks.
Archery - Marked for Death with Valley of Death Rune, excellent synergy with Caltrops as both are marked areas on the ground.
Devices - Multishot with Supression Fire Rune, Not entirely sure if I would keep this but in theory would be useful to keep your Discipline high as every enemy hit gives you 1 Discipline back.
Shadow - Companion with Bat Companion Rune, handy bit of passive Hatred regeneration, also it's a Bat, Bats are awesome!
Passive Skills
Vengeance, Extra max Hatred is always handy and more resource regen hooray!
Custom Engineering, Excellent synergy with Caltrops and Marked for Death, 100% duration on both skills, yes please!
Cull the Weak, Nice synergy once again, 15% damage on slowed enemies.
0
http://us.battle.net/d3/en/calculator/demon-hunter#WZYURQ!bUc!aYaZbZ
This is something I came up with focusing on slowing enemies as much as possibe then using the runed version of Impale to hit targets in a straight line.