The Steelcase Leap v2 is also fantastic (the differences are not major, I believe, and it was The Wirecutter's previous top choice [1]), and can be found fairly cheaply on Craigslist. I bought a refurbished one for $250 recently.
Compared to most high-end chairs like the Herman Miller Aeron, Steelcase's chairs are very soft and body-hugging.
That said, if money were no object and looks were king, I would go for an Interstuhl Every [2] or the FK84 by Fabricius and Kastholm for Kill [3].
