Necro + shaman is one of my favorite duos.
Getting a regeneration spell to counteract necro lich makes grouping much more relaxing, allows necro to throw heals out to counteract the shaman canni, slows are huge, HP buffs in case your necro charm breaks. Shamans are pretty tanky which gives you a bit more time to react and CC with roots / necro mez if things go bad. Just feels really safe.
Edit: But the "best" from your options is probably enchanter + shaman, probably only bested by enchanter + cleric, though I am a fan of necromancer!
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Khet - Level 59 Iksar Necromancer
Taiku - Level 34 Iksar Monk
Amualia - Level 59 Dark-Elf Cleric
Maruki - Level 23 Iksar BONEKNIGHT
Lorelai - Level 54 High-Elf Enchanter
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