I use the Microsoft 4000 Ergonomic, it saved my life; well, my hands. I was beginning to get serious RSI pains until I switched to this keyboard.
The keys are split in such a way that your wrists remain straight whilst typing, and it is angled so that your hands point down and not up, this also reduces strain on the wrists.
The only thing I'm missing though, is some lights; that would be perfect! :-)
Do you mean one like this one? https://www.amazon.com/Microsoft-B2M-00016-Natural-Ergonomic-Keyboard/dp/B000MQAPPC
I had one like this before but an accident occurred ... my fault XD. It broke and as I work a lot at night I decided to try this with light. I have to admit that I am feeling the difference in the position of the keys ;) but the light helps a lot.
A mix would be perfect but I have not find one still. Lights are more for gaming keyboards and the ergonomic stuff for writting ones ... looks like that is how those who make them think.
Btw, you are welcome (saw your message) :)