Topic.

Also, is it worth the perks if that is all you are using it for?

What build did you choose?

One way is to perk up to expert spells (illusion is an expert spell) and maybe dual cast, depending on how comfortable you feel with 30 seconds of invisibility. But if I had mana to spare, I wouldn't go past novice Illusion and dual cast.

Deciding between a pure mage of some sort, or an archer who uses conjuration.

So arcane archer