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The key thing is the very low sensitivity of your speakers; only 85 db/watt/meter. That requires a great deal of power.
This means that 10 watts will give you a SPL of 95db 1 meter in front of your speakers, and 100 watts will give you an SPL of 105 db. 105 db is quite loud, but thatis one meter in front of the speaker. At normal listening distance, it will be considerably less.
Based on those facts, I would say that the 80 watt amplifier would be inadequate for those speakers. The 150 watt amplifier would be barely adequate.
If I were shopping for an amp for those speakers, I would want something rated for at least 200 watts per channel. The 150 watt amp may be sufficient, but I certainly would NOT want the lower-powered amp.
By the way; doubling power is a 3db increase (not 1 db).
3db = 10 to the power 0.3 = 2
10 db = 10 to the power 1.0 = 10
I recommend the Musical Fidelity M6si, which is a much better-sounding amp which has considerably more power.
It would be far more appropriate for those excellent speakers than the NAD, both in terms of power and also superior sound quality.
I would agree with commsysman. It technically depends on listening levels, room size and how far your listening position is from the speakers but the 85dB on those speakers is quite low. I doubt 80w would be enough. I have a speaker that is rated at 85dB (Raidho X-1) and am delivering 150w into 6 ohms and it is adequate for normal listening but I am in a small-medium room sitting 8' from the speakers. In a larger room or if I was sitting slightly further from the speakers I would need more power. The 150w amp might be adequate but 80w won't be.
Besides the Musical Fidelity M6si integrated, which is really an awesome unit, you might also want to consider the following integrated amps :
* Rotel RA-1592 ($2500).
* Parasound Halo Integrated ($2500).
* NAD M32 ($4k).
* Classe Sigma 2200i stereo integrated amp ($5500).
* Hegel integrated.
* Some McIntosh integrated amps.
I forgot to include the Peachtree Audio Nova 300 integrated amp ($2500) and the Rega Elicit-R integrated amp.
The Rega does not have DAC. it is strictly analog integrated amp.