I'm some 193-194cm and 120kg, and use this one:
WAU 2- W-709- BÃ?rosessel- Netzstoff- Bewegungsmechanismus "slid"- 2 Versionen: Amazon.de: Bürobedarf & Schreibwaren
It's great - adjustable in a million different ways and helped with my back pain, and it's available in Canada/US too as a friend of mine bought it.