In need of a new office chair - my back can’t much more of the current chair. I’m sitting for 6-8 hours daily.
What’s your recommendation?
#1 recommendation -- go and try out various chairs to determine which one you find comfortable.
Not me, or anyone else, because fit, and preferences will differ. Also keep in mind that a model like the Aeron comes in different sizes.
A commercial-grade chair can be a costly investment, so take the time to do the research and shopping.
That extra cost brings better materials, build quality, and serviceability. Which means that unlike a cheap chair that becomes landfill fodder when it wears, or breaks, the spendy charis can be repaired, so there also exists a used/refurbished market for them, at lower cost.
@TVreporter:
@TheIntruder (quoted above) has made some excellent suggestions, not least, to try out many different chairs for yourself, as size, fit, proportions, comfort, materials, quality, will all differ, and differ significantly. Personally, I also recommend arm rests.
This is an area where subjective preference does matter; we can advise you, but only you can tell whether a chair meets your own, specific needs.
To those I would add, while you may have set a budget, and a commercial grade chair will be costly, if you are sitting in a chair for six to eight hours a day, it is worth spending as much as your budget permits - as much as you can afford - on a chair that meets your needs and that you find comfortable.
My own chair was made to order by the German company Klöber, and is superb, offering comfort, quality and lumbar support. However, needless to say, this came at a price.