Well I've had my NAD M51 for over a week so far using it everyday and I figured I'd post up some impressions and opinions on the DAC. First I will say that my unit is a factory (NAD) refurbished which saved a few hundred bucks on the unit. I ordered it from SpearIt Sound up in Massachusetts and they were top notice professional throughout the whole ordering process and are an authorized NAD Dealer. Upon arrival, I have to say I had all the factory boxes (double boxed) with the NAD sealed tape across...