IMHO the B&K is a sweeter, warmer sounding amp than the NAD. The NAD will have more dynamic power and probably a bit more bass control. I agree with the above comment...buy the B&K while you can.
Circa 2003, I had a B&K 2 x 200w (can't recall model #) that had a great sound. But, it died after only 4 weeks. Returned it to the dealer and got a Rotel instead.
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