Well, if you have such a low con then i wouldnt use the claw, though its very good against missile attacks, and that helps you so that your spells arent interrupted. id choose ring of wizardry and a ring of protection, though you can use an amulet of protection for now (till you get the ring +2) and use a ring of invisibility for now. Also id get the robe of archmage, it has a nice AC of 5 (good for a mage).
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"I miss the Angel... and I mean that I REALLY miss her" -Ertai, Captive of the Blinding Angel