ExtremeTech published a review of the Das Keyboard Professional keyboard:
Silence is overrated, or at least that's what the makers of the Das Keyboard would like you to think. If you're in search of a keyboard that has the tactile and aural feedback of a typewriter, then fix your attention towards the Das Keyboard Professional. It's shiny, it's loud, and it'll bug the hell out of your co-workers—so please, use discretion in the workplace.
Unlike the first two Das Keyboards, the Professional doesn't have the allure and mystery of label-less keys, a tactic meant to discourage hunt-and-peckers from looking down at the typing area. Aside from its labeled, clicky keys, the Professional has refined its appearance: a leaner 18x6-inches, glossy façade, durability of a freaking tank.
Check it out over here. The reporter says the board is quite pricey ($129) and offers little features but the tactile and aural feedback is great.