Best healer for a 4x Warlock Comp?

[Apatheist]

Paladins aren't as mana efficient as priests in this comp. When pet tanking and channeling hellfire there are 8 targets that need to be healed. A single prayer of healing will heal all of them. Paladins can't keep up with single target heals. Particularly at low levels where you don't have the +healing or crit% that paladins rely on for efficiency.

Also, nobody has confirmed whether pet tanking dungeons will be viable at 60 yet. Threat values for pets on classic appear very different than they were on private servers.