I've dealt with office chairs for 30 years in my day job as an engineer. Since the company has a huge selection I've been able to try just about everything. Since I'm a musician and am critically concerned with overuse issues I've also deeply looked into ergo issues (we have a dedicated ergo department at work, but unfortunately they just taught me that mainstream ergo is somewhat clueless)
General points:
- When looking for a chair you can't go by first impressions. Many a chair I've tried that felt great at first but became a burden after six months of use.
- You want maximal openness and freedom of movement. The important thing isn't 'correct posture' but flexible posture. Our bodies appear to have evolved to require lots of changing position.
- Since DAW work usually involves a piano keyboard that has special considerations too. In particular having support for lots of computer and piano keyboard use is the main requirement (e.g. you need to have piano players posture', or something close).
- In general I've found the Balance method the best at how to carry yourself in a chair or standing
- What you want is the 'dressage riders' position, you want a small forward tilt to the pelvis to give you spine freedom and the natural curvature. So you want a chair that supports seat pan tilting.
FWIW my opinion from using all these chairs (and more) for greater than 1 year
Herman Miller Aeron
Cons: These are in the 'feel great at first but not for long term'. Problem with this one is it locks you into a position, the adjustability of the arms is ridiculous, and I can't tell you how many times I've seen those stupid little 'lower back support' bumpers come off. Because for some reason they became popular the price is jacked up now too. For piano master keyboard it would be a disaster IMO. I'm sure people will be upset at me for this, but I spent years in this chair and learned all of it's problems - if you like it then ignore my view here.
Steelcase Leap
Pros: Great chair, comfortable with a degree of openness. I use this for composing at a desk (paper based)
Cons: Doesn't have seat pan tilting
Steelcase Criterion
Pros: Best chair overall, most open, most adjustable I've found and made to survive a nuclear blast. Importantly it has the seat pan tilt control, widely used and sold so can easily be bought used or for a decent price (for a high end office chair). I use this at my DAW
Cons: Rather heavy. Does not give an exciting impression at first, but for long term I've found it the best.