I sat on one of these for a while: http://www.amazon.com/Salli-happy-ergonomic-seating-SS-TW-L5041/dp/B002F4VXFA http://www.amazon.com/Salli-happy-ergonomic-sea

I sat on one of these for a while: http://www.amazon.com/Salli-happy-ergonomic-seating-SS-TW-L5041/dp/B002F4VXFA http://www.amazon.com/Salli-happy-ergonomic-seating-SS-TW-L5... Extortionately priced, but I liked the hip angle, and mobility it encouraged, and the fact that you were so close to standing height that you could easily move between sitting and standing (still need a sit-stand desk though).