Help find me an office chair (Everyone else does it)

http://cgi.ebay.com/Herman-Miller-AERON-Chair-SIZE-B-LOADED-WITH-ALL-OPTONS_W0QQitemZ170119718279QQihZ007QQcategoryZ25328QQrdZ1QQcmdZViewItem

We have these here at work, they are pretty good. Takes like 10 minutes to find your sweet spot, and then like a week later someone steals your chair rar.