Maybe something like the Nowy Styl Net Motion? As Acroig pointed out, chairs are a very personal choice, it's hard to recommend one. There are a ton of very good ones, but to be honest most of em are very pricey like the Steelcase Gesture. You can obviously also go the KAC-route and buy something cheap, like the IKEA Markus which is also not a bad chair. Another one would be the Maxnomic Classic Casual.