I've had a Steelcase Leap for more than a decade (maybe getting on 15 years?), still very happy with it. I was lucky enough to get it from a used office supply store for like $600 if I remember right. But I think it'd be worth it for even full price after all this time.
I have the Steelcase Leap as well for over 15 years at work and the Steelcase Gesture. Both are great chairs.
As another poster suggested, the most comfortable chair is the one you find comfortable. Definitely go and sit on a few, then see which one feels the best.
