I am planning to get into the Thieves Guild and Dark Brotherhood questlines. My character is a sort of a Battlemage with Heavy Armor, Destruction, One Handed, Illusion, Smithing and Enchanting focus. As of yet, I have maxed Sneak. I am currently at level 62, have about 3 spare perk points and a perspective to grow to about level 70.
I was wondering, whether I should pick up Light Armor or Alteration, as a Thief or Assassin in full Daedric armor is a bit silly. You know - you can't sneak in them, even if the game thinks you can.
So basically I can't decide which skill to pick. I have invested in Silent Casting, so as to utilize both Spells and Weapons in an effort to make my character a sort of magical assassin. Alteration seems to have cooler perks and isn't as redundant as Light Armor to my hero, yet I still can't decide whether it's a viable choice for a Thief. You know - evil Dark Brotherhood killer can use it, but Thieves guild members aren't exactly known for their skill in magic.
Another point is, that I don't have that many perks left to acquire and I have been considering that I could also learn Archery. In this regard Light Armor seems better, as it doesn't require such a heavy perk investment.
So what do you think is more appropriate?