I had been using a chair that was past its useful life so I asked friends for recommendations recently. Besides the chairs you see recommended elsewhere in this very thread, one friend recommended a "gamer chair". I was dubious, but it had some nice points:

- has all the features of expensive office chairs

- not mesh (I hate mesh chairs)

- half the price of fancy office chairs (~500USD)

I got a Secretlab Omega specifically and after a week or two I'm happy with it.

I can't speak to long term back effects, but it has more options with height and angle adjustment than any chair I've ever had and comes with a lumbar support pillow.