Sarthaal Amulet and the Diadem of the Savant are two more because you can't duplicate those effects.

Iron Daggers are simple, since you get the items then it's two button presses per. Enchanting is eight. (Item tab, item, enchantment tab, enchantment, Soul Gem Tab, Soul Gem, craft item, confirm) Plus you can't even line them up with the 'confirm' dialogue option so you're either using the mouse to move around, or Better Dialogue Box controls.

I'm really partial to Zim's Immersive Artifacts instead. Volendrung has it's standard drain 50 Stamina, but you can paralyze with a Sideways power attack, and while it weighs 35, it also costs less stamina to power attack. Dawnbreaker does 40 fire damage, with a bonus 20 on the first hit to undead, a 35% chance to stagger them to a knee, and a 5% chance to knock them down entirely. Plus if you're a two-handed character, you can swap it out into a two handed version. Wabbajack doesn't do damage, but keeps their health, so while they might be a super tough rabbit when transformed, if you kill them they die instead of just turning back to normal. Plus it can instantly kill very rarely.

What I really like is how strong it makes the Nightingale gear. It means there's some chance you're actually going to want to wear it all, instead of just slapping on one or two pieces now and again. And also the Staff of Magnus instantly kills Magical Anamolies which makes life so much easier doing the radiant quest bits. Also Thane weapons are now interesting and useful, instead of just 'Blade of X'.