For versatility, I usually go with a Spellblade (Not necessarily a Sword.) You've got ranged, and close quarters covered, without switching, and the magic goes right through armor. I feel your ennui, I've stopped playing for a couple months, hopefully the new Dragonborn DLC will hold interest until TES:O comes.
Redguard, Skyforge Steel Handaxe, Destruction, and Alteration. Unarmored for mobility, I don't hang around in the melee', but run around it, and use Critical Charge to quick strike, then usually Wuld back out to continue pumping them with Firebolts, or whatever. Eventually an Ebony Handaxe, when I kill the right DDL, I like the Hack&Slash perks to keep the DoT going while I circle around for another attack. Critical Charge runs down your Stamina while your Magicka recovers, so definitely Archmage's robes, or Masters' of Destruction. Maybe Nahkriin too, try not to get hit enough to earn Armor XP, or Morokei since it doesn't interfere with Mage Armor. Atronach Stone is real handy too, especially stacked with the Perk. I don't go any higher than Ebonyflesh, because that means having to re-draw my axe, and it lasts at most 45 seconds (With stability.)
Try not to get too OP, I find it gets boring a lot faster without a challenge, nor any hope of being killed. Also, the variety of spells, attacts, and battle tactics make this less repetitive than standing there, and slugging away with a tank.