(I'm ignoring Dawnguard completely, because I have no experience in it, and it's beyond the scope of the Vanilla game.) The last part, Restoration is almost Mandatory at this point, because you can wear Robes to get some Magicka back, and use Healing Spells to Recover Health, and Stamina with the right Perk. In return, you cannot Heal, regain Stamina, nor Magicka normally as long as the sun is up, so you have to depend on this incredibly weak 'Special' power, potions, and Restoration half the time, or sleep every time Dawn breaks. At this point, you get a whopping 25% boost to Illusion, and Sneak (Which hardly affect you ability to do either) and 3 points of Absorb health/sec for 10 Magicka/Sec. Yes, being a Dunmer counters your Weakness to Fire, but only up to Stage II.
