Both that one and Yogitype are angled vertical and neither use mechanical switches. Interesting design, what's with the backward printed number and functions? Are you supposed to use a mirror to see them? And the left thumb "space bar" is probably more useful as a Shift than Backspace, but at least it has a different function! It's irritating to me that the strongest digits do the least work on a "normal" keyboard.
ErgoDox or the unreleased Nexus (AcidFire's current project) would be your best bet, IMHO. You can make mounts to get them vertical if you want, although it's probably best to use them at a lesser angle in terms of optimal ergonomics. They both use mechanical switches and thumb keys. They also use vertically staggered columns which is much more ergonomic than horizontal stagger.
Another option would be one of the contoured Kinesis models. They have keywells and thumb keys, but are closer to flat than vertical.
Vertical is too close to maximum supination, just as flat on the table is too close to maximum pronation. Somewhere in between is best IMHO.