Advantage360

Kinesis Advantage 360 is quite well built but expensive. Other well known option is Glove80 but not everyone enjoying low profile choc v1 switches. Corne is a bit different category with fewer keys and not everyone enjoying tinkering with keymap to compensate this. Most of split ergo keyboards are a

It was worth it for me; I don't regret buying it at all. I type much more than the average person, and a Kinesis board is the only thing I've tried that doesn't give me wrist pain. I use the Adv360, but you will get many of the same benefits with the Adv2 (better hand positioning, contoured keywells