No mention of the Kinesis Advantage 360? I was lucky and scored two of them for free, one from the ergo center at my employer, and one from a generous coworker who didn't vibe with his.

There are a lot of keyboards I'd like to try, but I'm pretty happy with these.

Thanks for mentioning it, I included the Kinesis Freestyle (traditional split) but I think it's worth including the Advantage. Added!