IMO the choice of keyboards is 1 part engineering, 1 part features, 3 parts touch, and 6 parts personal preference. Unfortunately the personal preference can only be determined with use. I went through several "ergonomic" keyboards and keyboards with a variety of key actions. I became convinced the best keyboard I had ever used wa the original IBM with its clickety-clack sound and positive over the center feel and finally found one that was Apple compatible for the bargain price of $125. But after years of use I became convinced between its siae and the blankety-blank USB cord it took up too much room on my desk. I invested in an Apple Wireless keybord. Initially it felt too constrained, had too soft a touch, and I didn't like it much at all. But with use it has become my keyboard of choice. I have added a wireless keypad and replaced the mouse with a wireless trackpad and can't imagine switching. (Well I might switch the wireless trackpad for one with the new 3D action.)
The point is ulnlees there is a glaring shortcoming(s), an "ideal" keyboard is one you use long enogh to get accustomed to its particualr idiosyncrasies.
