Ask HN: What is the best programming chair?

I've decided it's time for a good chair but I don't know which one to get. I had an Aeron at a previous job. I really liked it, but not so much that I won't consider something else. I've noted Steelcase Leap and HM Mirra getting good reviews, among a few others.

What is your favorite chair and why? Also, probably more important, is there a brick and mortar that sells these anywhere that I could actually try them out? Closest I've found is a back store in my area that carries high end chairs, but doesn't actually have any of the above mentioned brands.