Ive spent most of my adult working life sitting in high end offices, visiting company site(s) etc.
The only time in those 12 to 13 years that I actually had to get up off the chair and go round to the back of it, "to find out just what chair it was" due to its amazingly confortableness, was when I sat in the Humanscale chair.
Im about 90% sure its the Freedom, I dont believe their range is that wide so yeah thats the one.
That does not necessarly mean I would buy that chair because I would have to factor in the location and how it matches to any desk in use, for instance the desk may require a height adjustable chair, it depends but normally a chair is a chair for a desk..
My contrubution to the thread behond +1 to the human scale which I dont know if it ha been mentioned yet but, you have to get one of these.
It will protect your carpet, and give a professional finsh to your home working enviroment, well worth $20/$30.
They also seem to do wooden versions, this is bamboo.
Darker version, it maybe oak.