6 feet and worried about hunchback problems in future, seeking recommendations

I am 6'0 and between 150-160 lbs, and I spend pretty much every waking hour of my life in front of a computer screen (yes, I know it's an unnatural lifestyle, and I did read the megathread about it). Lately I've started developing a minor hunch and I've been working on stretching exercises + correcting my posture to combat that, but I figure getting a good chair that I can stick with in the long-term will help me out just as well. I am not comfortable with spending more than 700 dollars on a chair regardless of its quality, and in my experience, buying used has always been a serious gamble, one that I'd rather not take if the option to buy new for a reasonable price is there. The qualities I most want in a chair at this point in time, alongside comfortably accommodating someone of my height, are the following:

1. No faux leather or other material that peels/flakes/wears out quickly. Every single chair I've bought that has faux leather always ends up falling apart within a couple months.

2. High-Back is preferable. Since I'm trying to work on my posture, I want to be able to lean back and feel comfortable while doing so.

3. Headrest, adjustable if possible within my budget. Again, this is primarily to help with posture, however I will skip on this entirely if a high-back is high enough to wear a headrest may not be needed.

4. Padded armrests. On armrests which have no padding or very firm padding, I always end up developing ugly callouses on my elbows, and it's generally uncomfortable.

5. Long-lasting. Up until recently, I've only spent 150-200 bucks on a chair and always ended up having them replaced within 1-2 years, and I know it's the classic story of "you get what you paid for", but when the recommendations being thrown my way reach the 1000-2000 dollar range (almost equal to the cost of an actual gaming PC), it always ends up scaring me to high heavens.

Given my budget restrictions and the criteria I'm looking for, I'm guessing I don't have many reputable options at present, but any pointers would be helpful.