Since you don't often do battle outdoors Vampirism is a big plus - gives you improved sneak, illusion, and a invisibility ability later on. I avoided it for roleplay reasons though.
I wouldn't recommend Destruction, it means you have to put more points into Magicka, and besides the whole point of the playstyle is that you get right up close before striking with a sneak attack, and then when fighting in melee you use nothing in your offhand so you can parry - not really much room for ranged magic in there.
Since you don't often do battle outdoors Vampirism is a big plus - gives you improved sneak, illusion, and a invisibility ability later on. I avoided it for roleplay reasons though.
I wouldn't recommend Destruction, it means you have to put more points into Magicka, and besides the whole point of the playstyle is that you get right up close before striking with a sneak attack, and then when fighting in melee you use nothing in your offhand so you can parry - not really much room for ranged magic in there.