I've inherited an Aeron that's well over ten years old, and am very happy with it. My biggest complaint is it is not something to sit on to put on pair of shoes. You almost feel like you're being pushed off the chair. I understand you tried it, and it didn't feel right. I encourage you to continue to you find what is right for you.
My office did stock HumanScale chairs. Comfortable enough, however the arms regularly broke. There was a weak plastic piece as part of the design, and they just cracked regularly. Our office always had a corral of chairs awaiting repair.
Our new desk chairs are Steelcase Series 1. I would rate them Aeron, HumanScale and Steelcase (for me. I wouldn't buy a HumanScale with my own money, but I'd prefer to sit in it if my employer pays for it!) I find the Steelcase S1 is just not comfortable for long periods. This may be deliberate as our new work space is supposed to encourage people to work in different areas.
I know Recaro makes some novelty desk chairs. I would take them for a test drive (sorry for that) if I were buying something for myself.