If you're really hot for the biometric security, there are a number of el-cheapo USB mice incorporating the hardware now.
I'm not really in the market, but regarding price --- perhaps an insert could be developed to fit some commonly-available ATX case with a full slide-out mainboard tray? Then only the custom component needs to be shipped, and people can track down the commodity bit at market-rate (and petition the manufacturer to keep them in the channel, I suppose).
For those who desire it, a ghetto color-change effect can be accomplished simply by placing independent LEDs aimed into the same acrylic light-pipe; seen this inadvertently on some generic PCs of late, and if you interleaved an array of, say, green 'power' LEDs with amber 'HD' ones, you could get a dramatic effect.
I suppose there's also the external PSU, bolts-to-a-VESA-mount idea, wherein at this point the display just might be able to hold up the computer. Not really sure how that works out physically with an expanded 1200, but it might be interesting to just mount the board and busboards open-air there, then use rounded cables into drive enclosures and the like.
