Necro / Shaman or Necro / Druid.
The regen provided by both will allow for more efficient mana regeneration on the necro's part, especially if you're a high level druid in which case natureskin + regrowth virtually negates health loss completely until you get to Demi Lich.
The necro can also ghetto heal the shaman, allowing them to cannibalize on a more frequent basis, thus allowing for more slows / dots etc. The fact that health regen is negated as aforementioned also allows the necro to avoid using lifetaps (which are particularly mana inefficient compared to typical DoTs), freeing up mana to spend on dps-enhancing dots or nukes.
A druid would lend itself to fear kiting or mass snaring/quadding particularly well, whereas a shaman would be able to assist with root rot, aggro kiting, or fear kiting. The slows would also come in handy should you attempt to duo a particularly hard-hitting mob / group of mobs.
It's really a toss up, either combo will excel in different zones / situations. For most indoor zones though, I'd have to go with shaman.
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