So... Can't decide what's best! Flat mana regen, scaling mana regen, or armor (or just some plain scaling health! :O). I've noticed on a lot of high elo streamers that they're using armor seals on their mid AP builds. I guess Ahri doesn't need it if she gets some early dorans and blue, but why the huge popularity of armor? Especially since it's not that much and most ADC will have enough arpen to just ignore those seals.