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If you're willing to spend $400, what's $300 more to get the best chair ever made?
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QFT.
I purchased an Aeron almost seven years ago and it was a great purchase for me (I use it every day for work and anything else computer related).
I highly recommend
Sit4Less - they offer a 12-year warranty on the chair. I have had to use the warranty twice -- once for the arm of the chair (the pieces that allow you to adjust the arms up and down broke after about 5 years of wear and tear) and another time when the hydraulic chamber (that allows you to move the chair up and down) stopped working.
Both times they were extremely responsive and I had a fixed chair within a couple of days (including sending someone out to change out the hydralic chamber). Cost to me: $0. Bonus that I was able to handle the warranty request over email -- never even had to call anyone!
To me spending $700-800 *once* about every ten years >>> spending $150-300 every 3-4 years as your chairs break. Also, this chair is MUCH more comfortable than any other chair that I have sat in, especially if you are going to be using it for long amounts of time (online poker, anyone???)
Save up the extra $300 or so and buy the Aeron. You might even be able to find a used one for cheap on eBay.