The very best office chair in the world is ...  a Liberty chair with a mesh back. They are sold through upscale retailers. About $750 new, I bought one used for about $450 (end of model year, last one in that color), and then bought another used one I LOVE it so much. If you are going to have a boring, CPA like job, you might as well treat yourself to a great chair. It looks really cool next to my old corporate looking maple desk.