User blog comment:CrimsonPhoenix62/Mage Builds/@comment-2086180-20120714221943

May be a bit late to reply, but if not...

About some of those perks...

Mage Armor- If you pan on Mastering Alteration, as your build implies, you don't really need it. The master level mage armor spell, dragonhide gives you pretty much max damage protection.

Ward absorb- Useful for fighting mages, dragons and other magical beings. Especially useful for dragons since using a ward with the perk will fully shield you from breath and restore magicka.

Conjuration dual casting- If you plan on getting the permanent thralls it's pretty useless.

Also, I'd maybe advise against frost magic specialisation in destruction, since enemies such as undead and dwemer automatons (lots of boths of these) are resistant/immune to frost. Perhaps fire or shock might work better?