Since Barbarian is my favorite class I've got a lot of helpful (hopefully) insight into the various builds.
LeapI recommend the
Death from Above rune for
Leap, good to leap into a group and stun them at the beginning of a battle or to just leap in place during battle to interrupt elite/boss attacks and give yourself a breather. Also, remember to use
Leap in battle whenever it's ready as the cooldown is short and it gives you a nice boost to your Fury.
BloodthirstWhile
Bloodthirst is nice, I find it somewhat lacking if you have a decent Life on Hit item. For instance, if you deal 10K damage (after damage reduction) you only gain 300 life (3%) and the range of life stolen varies with the range of damage dealt. I notice it's more effective if you have other % life steal items to stack with it. However, An item with 300 life on hit mod or a weapon with a Star Amethyst would be superior in that the damage return will be a set amount.
I would go
Weapon Master, as you suggested, instead of
Bloodthrist for the increased fury regen.
Secondary AttackI strongly recommend going
Whirlwind as your secondary attack, it is by far the most powerful attack in the Barbarian's arsenal and is made even more powerful when used in conjunction with skills like
Wrath of the Berserker.
For
Whirlwind's rune,
Wind Shear will go well when combined with both the Fury generated by the Weapon Master passive skill (using a Mighty weapon) and the
Thrive on Chaos rune for
Wrath of the Berserker.
Critical BuildThere are a lot of Barbarian skills that do fun stuff on with critical hits.
The
Blood Funnel rune for
Whirlwind recovers 2% max life per critical hit, regardless of damage done. That's a consistent 600 life per crit for a Barb with 30K max life.
The
Battle Rage skill with the
Into the Fray rune will build Fury faster than any other skill I've seen. And if you use T
hrive on Chaos it will keep you in
Berserker mode a lot longer.
Check out FourTwoZero's skills to see how he stays in Berserker mode as long as there is something for him to hit:
Critical Whirlwind Barbarian Skills-420