Aeron. Get a fully loaded one with standard back support on ebay uk for about £250. Try it before you buy it if you can in case it has the 'used Aeron wobble' tho. Even the new chairs have a slight wobble built in to the design, but as the years go by this can worsen, depending on how the chair has been treated.
There are plenty about, so don't settle for one with scuffs and scratches tho if you don't care about looks, don't pay more than £180 for one like this and it will be a bargain in its own right too. Also, look out for ads that just use stock shots of fully loaded models. Read the small print of the ad and you'll often find that the chairs for sale actually come without arms, or don't have some of the features pictured. It's a bit of a minefield. Best buy is always to get from someone who is selling it personally as you can try before you buy.
Some of the ones on ebay have fabric arms, not vinyl or leather, but these actually cost more than the vinyl ones and are comfortable.
Go and sit on one in John Lewis or somewhere. Buying new at £900 for the basic means you're getting the 12-year guarantee with it as the original owner. The guarantee isn't transferable. In my opinion, paying £900 means you are getting a chair and the guarantee. Like, a £600 chair and a £300 insurance policy, if you like. Well, that's how I look at it.
As for the looks, not my cup of tea. Bit lumpy and cumbersome. But for comfort, and a chair that will retain value when bought secondhand, probably unbeatable.
Thank you... (Sits back down on his £4 three-legged IKEA stool.)
Edit: After all that, just bought two Aerons on ebay. Bargains...
