I'm guessing the Xserve was cheaper? (Taking a peek at "buy it now" prices on eBay that seems like a workable theory...)

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Bingo! Don't forget the redundant PSUs too!

The cheap USB audio device pops, cackles and buzzes A LOT and it's driving me crazy. Need a Griffin iMic ASAP!

Also, I need to figure out how to position the thing so I can both use it and admire the blinkenlights at the same time. It's too deep for any of my tables :'(