Chair choice depends on the ass that will sit on it
the Aeron chair DOES come in 3 sizes. you need to sit in it to determine which is best. Most upscale office stores will have one for you to try. There is a discount supplier out of Los Angeles if you decide to buy one.
The Relax the Back Store has several ergonomic chairs on display, as well as the MICROSPHERE.
The Microsphere is as close to an anti-gravity chair as you can get. If you have hip or lower back pain from sitting, this might work for you. The fact that the monitor and keyboard swing to you, its like lying down while you type.
In any case...its all about the comfort of your personal ass! Go sit on a few of them
