Das Keyboard, I worked with the IBM Model M: I knew the Model M; the Model M was a friend of mine. Das Keyboard, you're no IBM Model M.
That's not to say you're not good. Your mechanical switches have a sure click, a fast response, and deep travel. But the Model M produced more than a click; it produced something more like a clang. Something authoritative, ancient, and almost annoying.
The Das Keyboard does include two USB ports right on the side. There's also a version that has no symbols screen printed on the keys, which is certainly badass (until it gets annoying).
Unfortunately, the Das Keyboard costs $130 (either model). (You can pre-order for $100 for a limited time.) A brand new Unicomp 104/105, a remake of the original buckling spring Model M, can be had with a Windows key and everything for $70. That's almost half the price for what I believe is a better keyboard. (And that's not just fond memories; I just pulled down a Model M and clanged around for a while.)
See Also: IBM Keyboards - The Odyssey Continues [Dan's Data]