Buy it on: Amazon
The GM Seating Ergolux Executive Chair may not be marketed as a PC gaming chair, but it will keep you comfortable for long play sessions -- and long work hours. This this is pure ergonomics paired with a soft, genuine leather cover.
The seat padding is a little lacking, however. It also takes a bit of time to get fully adjusted for maximum comfort and back support. But otherwise, there's nothing to complain about here.
If you're after pure ergonomic back support for under $1,000, you can't go wrong with the GM Seating Ergolux Executive Chair.