I have a Das Keyboard with blank keys and the MX brown switches at work and very much enjoy typing on it. My only complaint is that the finish is glossy (not the keys but the surrounding plastic) and it always looks dirty.

I have tried the Microsoft Natural keyboards and other ergonomic ones and generally feel mehh on them.

I am currently saving up for another mechanical keyboard at home. I think I will try and test out the MX Reds this time around. I am leaning towards the CM Storm QuickFire Stealth

Though if I had some extra money lying around I would seriously look into the Code Keyboard