Consider a Kinesis Contoured keyboard. It took me about a month to get up to speed with mine and I now consider it to be the ideal Emacs keyboard, even without the foot-pedal.
No joke. I ordered my first one with a food-pedal, but found I wasn't actually capable of coordinating the timing of my feet and my hands sufficiently to make much use of it for modifier keys. For a while I used it to toggle the integrated number pad, but I gave that up when I realized I wasn't using it because the number row on the Kinesis is so easy to reach.
