Looking for advice for a new chair

[chili]

64yr old 6ft 1inch 13stone
Spent the last 5yrs sat in a vertagear gaming chair bought 2nd hand, its now getting a bit uncomfortable and has some unwanted squeeks n rattles.
So my son says i should invest in an ergonomic mesh chair, however there are no real places on the high street to go try one out
What can you guys suggest? money is an issue but if i have to spend £500 so be it.

thanks

 

[chili]

Can't fault my Sihoo office chair since I got it, comfortable for long gaming sessions and good support and adjustability.

which model did you get am looking at their chairs now