Chalk another one up for the ol' Model M, but I reckon it needs some improvements in this modern era.
I would pay $100 for a Model M clone with:

-USB 2 connection, plus inbuilt hub

-Windows keys

-Volume knob/keys

-Media control keys

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I specifically get my PS/2 keyboards without Windows keys because they look somewhat out of place in the absence of Windows

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Well, they are used to some extent as the Super key in GNOME and KDE (and possibly in other X11 GUI environments). It's used for other functionality, although I've only seen it myself in terms of Compiz effects. I only wish I could take out the Microsoft Windows trademarked logo from those keys...