Like many have said both druid and shaman get SOW, and thats so incredibly helpful to untwinked players it deserves mentioning again.
Shammy - DOTs, pet later, regen, heals, sow, not gear dependant, good mana regen with canni.. only real annoyance i can think of with the combo is the shammy HP buff line doesnt stack with the necro Shielding.. well that and Shammy starting areas are nowhere *near* Necro starting areas... Everfrost and Qeynos (if the necro goes Bertoxx) maybe, and even thats a huge reach.
Druid - Heals, regen, ports later on, CHEAP SNARE, tracking, magic based dots, sow, Skin-Like HP buffs stack with necro Shielding. And druids are good races, so the druid can bind anywhere and port out to druid rings to be the designated seller/banker of the acquired lewtz.
The OP wanted to know what compliments a necro well. Both are very solid choices. SK can certainly work, but theres such a large list of advantages going priest that it's not even a min-max thing, it's turning your back on a ton to get weaker versions of the same spells, the lowest possible melee dps, a high need for expensive gear to outfit a tank, and an XP penalty to share (even worse if troll or ogre is picked) for all the trouble.
As i always point out in these threads, if you do stick SK/NEC, pick human or erudite and snap up all the low priced Flayed Skin armor in East Commons you can. Lotta bang for the buck there for both classes.
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