I am taking a deep breath and I'm about to order a Gokhale chair. I'm wondering about which. height to purchase. I am 5'7 or 5'8. When I measure the height of the chair I think I need, it's about 20". But that could change depending on the height of a new computer or perhaps other factors. I'm wondering if perhaps I would be better off getting the tall chair. If it turns out the standard size is too low, I don't know what I would do. It the tall chair is too high, then I could put some realms of paper under my computer so that it is also higher. Does anyone have recommendations?