Firebats with Crimson Rune for the highest AoE damage (would switch with zombie chargers w/ red rune if I could confirm they can be cast faster or as fast as once per second).
Zombie Wall with barricade mostly for crowd control. If the zombies don't act as an actual wall but are just a line of damage which enemies can cross then I'd switch the rune to Unrelenting Grasp for kiting.
Horrify for CC beyond the zombies, slotted for extra duration so I only have to worry about 8 seconds of not having it up. I considered mass confusion slotted for CD reduction instead but from what I've heard, since it's only 'some' enemies nearby, it's not as reliable. The other other option is alabaster slotted plague of toads, but I'd need to see how they worked first and how reliable they were.
Haunt for Mana Return. With three of them rolling on enemies you're getting 100% weapon damage back as mana every second. Damage isn't bad either.
Zombie Dogs. This is the most uncertain part of the build for me, but I think even ignoring the dogs themselves, four dogs + crimson sac means a 160% damage bonus at all times. Alabaster rune and passive gives them extra staying power which, given how squishy minions were in D2, I'm guessing will be very valuable. The health for you isn't bad either.
Sac is pretty self explanitory.
Passives: Vermin for 20% more Firebats damage, which is your primary DPS. Same with Pierce the Veil. Hopefully the mana returns from haunt can compensate for the increased cost, but if not I'd probably take Rush of Essence instead, for better sustain.