With digital audio technology nearing perfection and 32 bit DACs now readily available, is there a price level at which there is no point in going past with regards to DAC perfomance? Asthetics aside, is something like a NAIM DAC worth the extra money over say a Benchmark DAC-1 (by no means cheap itself)? The reason I'm asking, is that I am about to set up a music streaming system and am looking at my options, for which there seems to be many, particularly as one box systems are getting more plentiful. The heart of any digital system is the DAC and it seems more important than ever to get this right, but how much more improvement can there be in this area, we must be well into the law of diminishing returns by now?