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The HHKB is great! I have a white one, and the only thing I'd change is to make the switches 55g instead of 45g, but then it wouldn't be a real HHKB, right?
The black one seems more photogenic, but the white one has more legible legends (for those of us who like legends). I may end up with one of both, but fortunately I have run out of money for now.
At the other end of the scale, have you considered a Model M?