@Meddler: Do you think Zed could stand to lose some of his base health regeneration?
Zed right now sits at 7.1 base health regen at level 1. Considering he's an AD assassin who frequently rushes a Bilgewater Cutlass, that makes him feel kinda oppressive against poke mages like Lux, Karma, Orianna, etc. If you want to deal real damage to him in lane, you have to get into his ultimate's range, which tends to result in him deleting you. If you keep too much distance, though, he'll sustain himself through all your poke, and you'll run out of mana before you can seriously threaten him.
I know Zed gets shut down really easily by Zhonya's or QSS, but before that point he's REALLY obnoxious. Manaless, harass-capable, very evasive, and very good at farm control. He should be paying for that a little more, don't you think?
Thinking on "levers of balance" for Zed, reducing his base health regen seems like a safe choice to lower his lane bully power without lowering his killing power. It'd be the same story as with Katarina's last nerf; damage sticks to her more if she doesn't evade it.