Good choice with the Zody.

People at my office uses the shopee makeshift headrest. It kinda work. But bottom line is it sucks. Not stable unless you push your head into it.

I would get the taobao.

Lots of office liquidator will sell one without headrest for 400-500 range. Currently I'm seeing a flood of fixed armrest Zody on used market. Personally I wouldn't pay more than 500 for some office unit with unknown history.

I got mine with headrest for 700 including shipping. The headrest sucks I'm afraid. But it's better than not having any.

If you bought direct from Haworth, good condition, can produce proof of purchase so next user can have that 12 years warranty, probably 1k max. But these chair are really well built, I'm not sure what's the warranty for. New unit from Lazada, one can get all black Zody for 1.8k without headrest. With headrest new was like 2.3k?

With that budget I'd say a used Zody from office liquidator.
I think I have spend considerable time searching for brand new chair under 1k that are can offer proper support, my conclusion is that there is none.