HiGHFLYiN9
Member of the Trade: Zynsonix
Another vote for the Aeron. They're $300-350 used and about $1,000-1,300 new depending on the color and bells/whistles (also you have to wait months if you get a new one). I really like the polished aluminum accents and base which you don't see on most used chairs. If you need a headrest, Engineered Now makes a good one. For the lumbar support, people seem to like the slightly older version to the brand new one. The chair is popular enough that you'll be able to get parts for it decades from now.