Follower: paladin

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

Legendary Gems:

Bane of the Trapped 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 Thrill of the Hunt or Sentry Sentry Polar Station Polar Station.
Bane of the Stricken 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 Boon of the Hoarder — synergizing with other farming mainstays like Avarice Band Avarice Band and Goldwrap Goldwrap, this gem will not only keep you rich, but also sped up and safe during normal rift farming.
Bane of the Powerful Bane of the Powerful — the speedfarm counterpart to Bane of the Stricken Bane of the Stricken, Bane of the Powerful 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 Zei's Stone of Vengeance is a multiplicative damage increase to long range builds. Taeguk Taeguk is a great addition to a channeling Demon Hunter, which you will be by using anything Strafe Strafe- or Rapid Fire 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
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