This weekend we will start with new 12th level characters (30 point buy, 75% of standard wealth), and I have decided to go for a Dwarf Wizard.
I don´t have the stats on this PC, but I try to recreate them:
Base Scores without racial and level adjustments:
Str11, Dex14, Con14, Int17, Wis10, Cha8
Since you have 2 points more available, you might distribitute them as you see fit. For pure survivability, chose Constitution, but if you are actually aiming at the Runesmith class, a higher Strength might be better (to be able to wear the armor), and maybe you should reduce the dexterity to 12 (since the Max Dex bonus of a full plate is +1).
Otherwise, an improved Wisdom might not hurt either, since some nasty effects rely on your Will save. With high HP, you don´t need a good reflex save, but many useful spells require ranged touch attacks.
Let´s assume you go for constitution and Runesmith (higher strength, lower dexterity) and get Intelligence and Constitution to even scores by your level increases, here the final statistics after adjustments:
Str13, Dex12, Con18, Int18, Wis10, Cha6
With these stats, you could even qualify for power attack! Maybe you´ll find a way to use that as a wizard

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HP for a straigth wizard (assuming averages) 60. Not so bad, I think...
For alternatives to the Runesmith:
I made my wizard a Transmuter, aiming for the Archmage Prestige Class.
I would also like to make a Diviner/Loremaster, but I am doing that already in another campaign. Since the DM for that campaign isn´t that great, it might not be bad to play the loremaster in the new campaign of the other DM, but on the other hand, the character might become boring this way...