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As far as NAIM goes, it sounds like a "naim fanboy" was making these claims. I'm not saying NAIM is bad or anything at all, but beauty is always in the eyes of the beholder. In your situation, the focal speakers are very fast responding and are definitely very efficient (at 91.5db). They would probably be fine with the NAIM. However, in my experience, Focal will sound best with a slightly warm or laid back amplifier, which makes your McIntosh MA6500 a very good match. The NAIM may or may not sound better, but it will sound different. In my opinion, I would probably want to keep the larger power supply of the McIntosh and look at speaker cables or interconnects to improve performance or resolution (if that's what your looking for).