Follower: paladin

Gems:
Slot Gems
Helm
Flawless Royal Diamond (or highest available)
Torso and Pants
Flawless Royal Emerald (or highest available)
Weapon
Flawless Royal Emerald (or highest available)

Legendary Gems:

• Bane of the Trapped — staple multiplicative damage increase. You will be proccing this gem either through its own level 25 ability, a slow (for melee builds), or by skill effects such as Thrill of the Hunt or Sentry Polar Station.
• Bane of the Stricken — almost mandatory gem for Greater Rift progression, as it is designed to whittle down the scaling health numbers of monsters with a percentage-based increase on successive attacks.
• Boon of the Hoarder — synergizing with other farming mainstays like Avarice Band and Goldwrap, this gem will not only keep you rich, but also sped up and safe during normal rift farming.
• Bane of the Powerful — the speedfarm counterpart to Bane of the Stricken, Bane of the Powerful offers a solid overall damage and survivability increase as long as your killing speed does not fall behind the timer of the gem.

Situational gems

• Zei's Stone of Vengeance is a multiplicative damage increase to long range builds.
• Taeguk is a great addition to a channeling Demon Hunter, which you will be by using anything Strafe- or Rapid Fire-related

Paragon:
Paragon Points
Slot Paragon Points

Core
Movement Speed up to 25% cap
Dexterity
Maximum Hatred (depends on build)
Vitality

Offense
Critical Hit Damage
Critical Hit Chance
Cooldown Reduction
Attack Speed

Defense
All Resistance
Armor
Life %
Life Regeneration

Utility
Resource Cost Reduction
Area Damage
Life on Hit
Globe Radius

Dawn
x Valla's Bequest
Manticore
Wojahnni Assaulter
x Odyssey's End
x Yang's Recurve
Karlei's Point
Lord Greenstone's Fan
x In-geom

x Aquila Cuirass
x Cindercoat
Visage of Gunes
x The Cloak of the Garwulf
x Zoey's Secret

x Convention of Elements
Avarice Band
x Ring of Royal Grandeur