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I can recommend the ErgoDox[0].

How about this one http://www.kinesis-ergo.com/shop/freestyle2-for-pc-us/ ?

It has one unacceptable flaw: staggered keys. http://loup-vaillant.fr/articles/better-keyboards

I used the Freestyle for several years. It's a lot more comfortable than any other sub-$100 boards I could find, but the rubber-dome key response is pretty lame compared to real mechanical switches. The horizontal staggering didn't bother me at the time, but now that I've switched to columnar staggering it drives me nuts every time I go back.

I have been using my Truly-Ergonomic for almost a year now. Zero complain :)