My initial recommendation would have been the Aeron - but as you say they can be pricey (between 500-1000 GBP depending on spec).
My only advice would be to visit a store and sit in as many as you can, check all the height, tilt adjustabilty etc.
Remember we spend upwards of 8 hrs a day in these chairs and I know from personal experience that poor sitting posture will lead to issues later.
You may not be suffering from back problems now but spending a little bit extra now may save you a lot of money on osteopath/chirapractors in the future.
My initial recommendation would have been the Aeron - but as you say they can be pricey (between 500-1000 GBP depending on spec).
My only advice would be to visit a store and sit in as many as you can, check all the height, tilt adjustabilty etc.
Remember we spend upwards of 8 hrs a day in these chairs and I know from personal experience that poor sitting posture will lead to issues later.
You may not be suffering from back problems now but spending a little bit extra now may save you a lot of money on osteopath/chirapractors in the future.