Goldtouch Elite is the gateway drug. It offers both a hinged split and tenting if you want it, while having the classic keyboard layout. Microsoft natural also requires very little learning curve, assuming that you don't use the wrong hand for some of the middle keys out of habit.
I use Kinesis Advantage2. I suppose they should be relatively cheap on eBay now. They still have a slight amount of ulnar deviation, but I find it's the best keyboard I've ever owned. I don't use all the macros and foot pedals and whatnot. You don't lose the ability to touch type on a standard keyboard, and it really only takes a day or two to have some proficiency, and maybe 2 weeks to get to full speed on the Kinesis. It helps greatly that all the letter keys are the same; it's just the thumb keys and the arrow keys that take some getting used to.
One massive advantage of the old Advantage2 is that there's a big empty space in the middle (with just the indicator lights). You can use museum wax to stick an Apple trackpad there, and then you hardly move your hands at all. I still have a trackball for large mouse movements or whatever, but most of the fine movements are done on the Apple trackpad at the center of the keyboard.
https://www.reddit.com/r/kinesisadvantage/comments/16994c7/t...