Two of which I've got a huge amount of experience with, and the last one is brand new and I'm steady in the lab experimenting with it. These aren't gear check intensive builds and you can play in content far beyond what you'd expect, as these builds are very safe.
However the safety of these builds are based on attentiveness. There is no DC protection, and if you fall asleep at the wheel you will die, unless the content was already trivial for you and as such any build in the world would work and a monkey could play at that point.
Here's the first build:
This one is very trap-centric, and is built around lockdown. The basic equipment breakpoints are -> 35% crit chance, 1.80 or more attack speed, 700 life on hit/some life steal, and preferably as close to 50 discipline as you can get. Dual wielding with this is preferable, as Danetta's set works perfectly(it gives you the attack speed, the life on hit, and the discipline - and Archery passive gives you 10% crit chance). It's a very stylish build.
Gameplay revolves around Nightstalker procs. Each encounter you drop sentry, and place caltrops on the ground. Fire off Cinder Arrows to top off discipline(nightstalker) from caltrop placement, and to restore hatred. The idea is that when the monsters approach and get snared by the caltrops you start Strafe Demo. The caltrops keep the monsters clumped up and let Strafe Demo do it's magic, as the attack in itself procs nightstalker discipline like crazy, and allows you to continue to drop caltrops while strafing. Each time Sentry is off of cooldown drop another one.
There was no rune choice on Sentry, Caltrops, and Shadow Power, as it's pretty much up to you. This build has a weakness against Reflect Damage, so Gloom or Blood Moon is preferable for Caltrops. Smokescreen Displace is used to speed up Strafe if you need to phase through monsters upon getting Vortexed.
This one is much looser but requires a big discipline and attack speed breakpoint. You want as close to 2.50 attacks per second as you can get, 60-70 total discipline, and 35% crit chance. The attack speed breakpoint can be achieved easily with 1h crossbow with attack speed(Calamity), and a Dead Man's legacy with 18% attack speed or more. The discipline breakpoints can come from cloak, quiver, 1h crossbow, Stone of Jordan, Lidless Wall, Xepherian Amulet, and/or Nat's set bonus.
The gameplay behind this build is that you use your attack of choice which has the open spot. Ball Lightning, Chakram, Sentry, Spiketraps, whatever. The key here is Stun Grenades, Shadow Power, Preparation, and Perfectionist. With 70 discipline, Perfectionist, and Preparation(any but Punishment), you can Shadow Power indefinitely. Stun Grenades provide crowd control, and each stun buys you discipline recovery time. Nightstalker and Backup Plan takes Lingering Fog over the top, as you can pretty much smokescreen for the entire duration of a fight. With enough monsters clumped up, using Stun Grenades, you keep them stunned while keeping discipline in check and avoiding damage.