Iksar Shaman, Iksar Beastlord, Iksar Necro and all your bases are covered. You have the healing/debuffs from the shaman and beast, tank from the beastlord, offtanks from the 2 pets and dps from the necro + 2 pets. Not to mention FD pulling, wipe insurance later on with necro rez and even shaman rez. As dungeons are the best place to level, you've got snare and root both covered as well.
ditch the mage, go with the BL and make them all Iksar.