Picking out that perfect chair for your computing needs can be as simple as picking up the cheapest $29.99 "office" chair you can find or as complex as trying every chair in multiple stores until you find the one that is juuuust right for you. Kind of reminds you of Goldilocks in the bear's cabin.
Comfortable; Flexibility; Mobility; Kept cool; Vertical adjustment; Lumbar and head/neck support
Adjustable arms loose