Not the most exciting thing you'll ever buy, but if you're after an office chair with pedigree and functionality, you might want to check out the Supporto office chair.
Designed back in 1979 by Fred Scott, the Supporto was one of the first office chairs built to strict ergonomic principles and still complies with all current standards. And of course, you can drop it to the correct height and wheel around your office (or indeed, your home office).
In terms of looks, well, it's certainly distinctive with those upright arms and a choice of upholstery, including both fabric and a premium leather. If you want one, prices start around the £800 mark.