Ergonomic Mechanical-Switch Keyboard?

dotancohen writes "As wear and tear on my hands builds up, I find that I need an ergonomic (split) keyboard. It seems the vast majority of available ergonomic models are either crippled with dome-switches or have unusual designs, which place many critical keys under the thumbs (I cannot use my right thumb). The one normal-appearing contender, the Northgate Ergonomic Evolution, seems to be noisier than even the Model M — in fact, it echoes! Programmers and hobbyists geeky enough to be here today: what do you type on?"