PC Gaming

The unfortunate reality of ergonomic office equipment is that a good chair will run you about 600-900 USD new (or more with options). There's a reason huge corporations buy from Herman Miller (the Aeron) or Steelcase. Those are the manufacturers that make the stuff reliably that will last for decades. The parts are heavy and made of a lot of metal.

If you spend less you're getting a lot of plastic that'll last maybe 5 years before the finishes start to wear off and you can't repair it.

So, decide what matters: saving a few hundred short term or risking hurting your back.

But the biggest thing to consider is that bodies are so unique that it's possible that a cheaper chair will work for you, but you'll only know until you sit in it. So go sit in a bunch and see what works. Note that the stuff Office Max et al sell tends to be cheap and kinda garbage. If you want the professional tier of chair, that will require a trip and possibly an appointment with a specialized retailer. Also check furniture stores; sometimes they have larger executive chairs that are quite comfy if not as ergonomically sound.