Walking while you work was the topic of an earlier post. This post stays within the same theme--how to be healthy at work--but with a different perspective--mine. I have some thoughts of my own on this topic.
For one, I would cherish the opportunity to move more through the day without sacrificing working time. It's not the walking part, really, as much as it's the idea of not sitting that I find attractive. Basically, anything that involves me not sitting would be of value. Alternatively, sitting comfortably and without permanently wrecking my posture would be a heck of an idea.
Somehow, I've never gotten around to buying one and my back really pays the price for my indecisiveness. What's stopping me? There's just too many from which I could choose! But that's not to say that I haven't given it a lot of thought. Here's the rundown on my years of searching. 
There's the classic Herman Miller Aeron chair. Everyone knows that the Aeron is pretty hard to beat when it comes to function and design. Being a lover of modern furniture, I can admire the Aeron even for the story of its creation--and if you haven't yet read the story, it's a great story of perseverance and dedication, of leadership and teamwork. Good stuff. The Executive Aeron can be purchased for approximately $1,300.
Herman Miller also offers the Mirra ($829) and Celle ($629) chairs as less pricey Aeron alternatives. Both chairs come in a variety of colors, which is an advantage over the Aeron. Color is important.
I have to pass on the Aeron because, honestly, it's just not "pretty" enough for me. Yes, mock me if you will, but at least I'm honest. I appreciate the aesthetic but I need more glamour than the black mesh has to offer.
The Freedom chair by Humanscale is next in the rotation. The Freedom chair (with headrest, of
course), also has plenty of design awards on its resume and is known as one of the best in the ergonomic category. But, to its credit, it comes in a variety of colors and textures, including leather, which happens to be my preference. At around $1,000, the chair is priced competitively. The Liberty chair, priced for under $800, is Humanscale's task chair alternative.
Next up is Steelcase--the maker of the Walkstation treadmill-desk combo that prompted this post. Steelcase has plenty to offer in the way of ergonomic seating, the two most popular choices being the Leap and Think chairs. Both are offered in various colors and both have a contemporary look, with the Think chair's sleek, linear design being my preference between the two. 
I've been known to be open to new things so it's not surprising that I've given a lot of thought to the out-of-the-ordinary seating options. For instance, the HAG Capisco saddle chair (in red, below, $690 - $1,200) dares to be different. Even assuming that it's as comfortable as could be and the look was where I wanted to go, the whole "saddle" concept just doesn't work for me. The idea is that you can sit in the chair backwards (why, I haven't the foggiest). Sorry, I wear too many skirts to make this a realistic possibility. I'll pass, although I do love the height-adjustable feature. In my ideal office, I would have a height-adjustable desk, making this feature quite important.
The same principles go for the "stool" option but, in the interest of fairness, I'll list them anyway. The Swopper Stool by Via (left, $600) is designed to force its user to keep their balance by engaging their abdomen muscles instead of letting us lazy office workers slump over in our traditionally terrible posture. The HAG Balans Kneeling Chair (right) is even less likely to ever see the four walls of my office. I've witnessed these in use and, unless you work at a health club or in another industry where you are expected to wear clothes designed for comfort, this option is just impractical. My devotion to improved posture is not this strong.
Now let's get to the serious contenders. If and when I get around to breaking open the office-chair-piggy-bank, there are just two that make me stand up and cheer.
First is the Steelcase Leap Worklounge Chair in Leather ($2,700-$3,400 depending on options). 
It's beautiful. And that's exactly why I like it. It comes in white leather, which is my favorite upholstery option (practicality be damned). There is also an optional ottoman but who has time to put their feet up? We're working too hard to afford the chair!
And then there's the ultimate in luxury office seating, the Silver chair by Interstuhl. Interstuhl is a German company and brings German precision to its line of couture office furniture. I could say more but the pictures speak for themselves.
Beauty is not cheap. The base model in black will cost you around $4,500. But why stop there? If you're going to do luxurious, go all the way. And Interstuhl has just the chair for satisfying the maximum luxury quotient.
For a mere $65,500, you can be one of the lucky owners of the world's most expensive office chair. You'll get not just the chair but the matching ottoman, as well, both of which are plated in 24-karat gold.
The chair has even had a few roles on the silver screen. It was used as Al Pacino's chair in the movie Ocean's 13. And, more recently, made a cameo in the latest Bond film, Quantum of Solace.
