I will second this. I used a cheap (<$200) Staples office chair when I started working from home. My reward for cheaping out on this was painful back problems. I eventually gave in and bought a Steelcase Leap, and the back problems quickly went away. So my advice is, there are lots of places where it makes sense to pinch pennies, but this ain't one of them.

Plus, Steelcase customer support is excellent. A couple of years after I bought my Leap, the gas cylinder that controls the height of the chair broke and started dragging on the floor whenever I moved the chair. I contacted Steelcase to see if there was some way to fix it, or to get a replacement cylinder. Steelcase's response was to send me a completely new Leap, without me having to do anything other than show my proof of purchase to demonstrate the chair was still in warranty. That is some seriously above-and-beyond customer support.