The ErgoDox EZ[1] is very cool. The split is nice on the shoulders and upper back. My favorite part is that they are fully programmable and easy to customize with the online configuration tool. You can see my setup for some of the crazy stuff you can do[2].

[1] https://ergodox-ez.com/ [2] https://configure.ergodox-ez.com/ergodox-ez/layouts/mlGrD/la...