Otar. My dual-casting battle mage kit includes it with Arch-Mage Robes , legendary daedric gauntlets with Fortify Magicka/Fortify Heavy Armor, legendary daedric boots with Muffle/ Resist Shock, Necklace with Resist Fire /Resist Frost , and Ring with Fortify Magicka/Resist Magic(the stronger enchant from the Shield of Solitude).
This combination gives you a higher armor rating than most mage builds and carries the added bonus of an 82% total reduction of magic damage for all 3 elements (all without having to carry a shield). At 100 skill in Sneak and with it`s basic perks, I`ve never experienced any stealth problems despite the Heavy Armor pieces.
With the extra 150 Magicka , 15% overall spell cost reduction, and 100% Magicka Regen this build provides, it`s rare that I have to get in the enemies` striking range for a melee battle.
If I feel the need to get blood on me , I use a dual-enchanted legendary daedric dagger and sneak-enhanced damage multiplier perk to eliminate enemies rather than my dual-cast Fire spells or conjured Atronachs/Dremoras. Silent Casting a Paralyse spell on the intended target pretty much guarantees you can walk up and single-stab the foe to death in most cases.
If I`m not confident that I`ll remain undetected and concerned about physical damage I might receive , I dual-wield daggers , drink a Fortify Alteration potion , and cast Dragonhide over my kit before charging in. With Dragonhide added , you get 88% damage reduction with an Armor Rating of 285 for as long as the spell is in effect.