I tried out the chairs at a local furniture shop (must do before you buy!) in Toronto called Design Within Reach http://www.dwr.com/category/workspace/task-chairs.do?nType=2. It looks like you can buy online, but if you live in the states might as well order directly from the manufacturer.
I liked the Embody a bit more, but was out of my price range. Favorite feature was the adjustable seat edge, which removes pressure points from your thy.
http://www.hermanmiller.com/Products/Embody-Chairs
I'm getting the Aeron http://www.hermanmiller.com/Products/Aeron-Chairs
I liked the Embody a bit more, but was out of my price range. Favorite feature was the adjustable seat edge, which removes pressure points from your thy. http://www.hermanmiller.com/Products/Embody-Chairs
Some people like the Mirra. I didn't find anything good about it. http://www.hermanmiller.com/Products/Mirra-Chairs
Humanscale makes comfortable seats, but don't feel as nice as the Herman Miller when reclined.
My favorite Humanscale chair http://www.humanscale.com/products/product_detail.cfm?group=...
Freedom Chair was the one the founder have the TED talk about. http://www.humanscale.com/products/product_detail.cfm?group=...
I haven't decided on a keyboard tray or monitor arm yet. Both companies carry both products.
People seem to recommend the http://www.geekdesk.com/ for motorized desks. Not a high priority for me.
Also, checkout the video on Humanscale to see what a complete system looks like set up. http://www.humanscale.com/products/workstation_video.cfm