From my experience best bear build for higher mp (~mp7/8) is this:http://us.battle.net/d3/en/calculator/witch-doctor#jUXdfQ!TY!YZYYcb
Where optional is, soul harvest rune (I chose duration one, as keeping 5 stacks with 60s is easier, and overall ot provides most sustained dps over entire run, if you never miss any stacks, which is easy with this rune).
Last passive, depending on what you are missing, blood ritual for mana, spirit vessel for more speed (reset cooldowns), jungle fortitude if you have trouble with reflects, and pierce the veil if you have good slow setup and can afford more damage at cost of all skills mentioned above.
The idea here is, to get burst damage vs each elite pack, voodoo + paranoia, it is up for every pack, or 90% of packs, with 200k+ unbufferd dps, melts elites in few seconds at mp7. And you don't need to use spiders for mana, even with pierce the veil, since stuff dies so quickly. That done with 1.2 aps weapon, and not using too many ias slots (no mempo, but good zuni helm instead, no inna pants, but mitigation rares instead ect).
Reflects with life steal are no problem, with proper use of horrify, having about 8k armor, 500k ehp, it is no problem.
I find this setup fastest, any modification that includes spiders for mana, or wos for ranged enemies, is significantly worse. Bears are far superior to any other skill, and even if they can be hard to aim at times, they deal so much more aoe damage, they are still better..