My criteria are:
1. Tough: I spend 12 hours a day in a chair. I'm hefty, so the chair needs to support me.
2. Comfortable: I want to be able to stand up from a 6 hour gaming session without my ass being numb.
3. Affordable: The less the better. More than the $50 cheapies I normally buy is ok, but no $1000 Aerons.