Started an Archer with Conjuration as second main skill. Mostly just so I don't have to make another smithing/enchantment 100/100 character again.

Works pretty well after a while and thanks to that archery trainer/companion you get bow damage to decent levels without much fuss. Conjuration perks further increase bow damage and a few points in sneak will get you good sneak kills, too.

Too bad that archery is a bit boring in general ... and if you get ambushed you'll have to leg it.
Otherwise that build holds it's own.

Don't you have problems with your summons getting in the way when you shoot? I can't seem to ever get the AI-controlled minions (followers, summons, etc) to stop from committing suicide by jumping in front of my shot.

How about getting 2 archery or mage thralls. imagine raining down flurries of arrows on your enemies while not worrying about friendly fire.