Ergonomic computer chairs

[bubbles]

I have 3 herniated discs in the lumbar region, causing sciatica down my leg and back pain. I need a really great ergonomic chair. The Herman Miller Aeron seems to be popular but it is very expensive at over $1000. Then there is "Ergohuman" knock-off for about $600. I found this thing called the "Swingseat" which is $350 and looks interesting, but I can't find much information about if it works or is just a gimmick:

What do you guys recommend?