I've used a cheap Ikea chair, gaming chairs (Secretlab Omega), a Steelcase Gesture and (my current chair) a Herman Miller Aeron. I strongly suggest, if possible, that you try them out before buying one. The Steelcase Gesture gets a lot of love on the internet, but after a couple months, it was putting an uncomfortable amount of pressure on my tailbone and a weird shearing force on my thighs where I had to get it replaced. Also, if you happen to live in a large enough city, look into getting a used chair, like a Herman Miller Aeron, which I did. I'm in the SoCal area, and there are SO many media/tech offices here that there's a huge used market specifically for Herman Miller Aerons, so I was able to get mine cheap and in surprisingly great shape for $750, which is half of what it would be new.