Yeah the all-iksar crew (SK/warrior, monk, shaman, and necro) would be pretty effective and look fantastic. A shaman and necro can keep the melee healed without problems, although casters will be a little rough.
Another fun unit that I always wanted to try was Rogue, Shaman, Enchanter, Bard. This group has sick dps (rogue+charmed pet with the bard tanking. Anyone can tank something that is 65% slowed), mana/hp regeneration (the shaman would be getting like 70 mana/tick. Wizards eat your heart out), and debuffs (malo/tash = I slow you 100%). Plus a lot of parentheses.
You could also try the all-dark elf squad: SK, Cleric, Enchanter, Magician. You should have no problems 1-60 if your enchanter is decent.
Or if you want to be really awesome, you could go Gnome Warrior/Cleric/Enchanter/Magician. Zones would simply implode from the coolness of that group.
I think the group that would level the fastest to 60 would be Enc/Enc/Mage/Cleric. Two charmed/maloed pets and some pretty solid mage dps with the cleric keeping everyone alive is just ridiculous.
Lots of good choices
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