Sorry to add even more confusion but you should think about the 2007 HeadRoom Portable Desktop Amp at $999. I recently had a chance to hear it at the November Seattle meet, and it sounded fantastic (CDP as transport, HD600 headphone). I've owned the $600 '06 MicroStack, and this is much much better.
Price-wise, it sits in between the current 2007 MicroStack and 2007 Ultra MicroStack. Sweet spot?
