The IBM Selectric, IBM Model F AT and IBM Model F XT measure in that range. Unfortunately none of those antique keyboards are practical in the modern world.
That's very much a matter of opinion. While I wouldn't argue about the Selectric or XT not being practical for most, some of us do love the Model F AT. It may not be the best layout, but it's the one I spent a huge amount of time with back when it came out. I still to this day do not use the extra keys on the Model M (inverted-T arrows/cursor keys), simply because I learned to use the arrows/cursor keys on the numpad back when the XT/AT were the only real game in town. I use the normal number keys for typing in numbers and use the numpad for arrows/page controls. If for some reason I'm doing some heavy-duty numerical inputting, then I'll use the num-lock key. Otherwise, it stays off. Being the AT doesn't have the separate arrow/cursor keys, it's actually much better for me than a Model M being there's less of a distance to move my right hand when changing between typing and cursoring. I know, I'm one of the weird ones. But having spent about 20 hours per day, 365 days a year on my Model F's for many years, I simply couldn't ever break my old habits for the new Model M. For me the arrow/cursor layout on the numpad simply cannot be beat. It just makes complete logical sense to me (Home: upper left, End: lower left, Page Up: upper right, Page Down: lower right). Whenever I see the Model M separate cursor keys and think about the layout, I simply say, "yuck"! Integrating the Home, End, Page Up, Page Down with the cursor keys is vital for my brain to be able to quickly navigate through pages of source code. Without that, I end up using the mouse much more than I should at a considerable speed penalty.
Now if you're talking about something portable, then that's a very different story. I despise all notebook keyboards and need to take a keyboard with me most of the time when I travel. A Model F wouldn't be very practical in that case due to it's size and weight. I still though find myself fumbling around with the arrow/cursor keys on any of the mini-sized keyboards regardless of how good their layout is. It's much better than using the native notebook keyboard, but I guess I've never taken the time to stick with a particular mini model and really learn it.
For a mini keyboard, I liked the MiniGuru "Home Row" concept. I'd still like for someone to come out with something similar to that for my keyboard for use on the road. For office use, if I was to design what I'd consider a perfect keyboard, I'd take Model F switches, use the Model M layout for Esc, Function keys (I do prefer that to the Function keys on the left), but I'd change the dedicated arrow/cursor keys to a similar layout as found on the numpad (11 keys total). Perhaps swap the Ins and Del keys, and maybe add some function to the key in the '5' position. Perhaps another Backspace...I'd have to think about that. Then still have the numpad, but obviously there'd be no need for the NumLock, other than perhaps for backwards compatibility. Of course I wouldn't expect many people to be in agreement with my preferences.