I always choose either a Sorcerer or a pure-class mage (though Wild Mage may be in my near future,) but if I had to pick a specialization I would choose Conjurer. There are a great many conjuration spells as everyone has already pointed out, and the only three spells I would miss from the Divination category would be identify, true seeing and oracle. But unless you're married to the idea of playing a specialist you should check out sorcerers or pure class.
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trux
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