I used to own the exact Marantz you're considering, the PM8004. Great build quality, nicely done, easy to use. But I made the mistake of trying to pair it with a pair of B&W PM1 monitors - that was not a good combination. Just not enough power, and my listening room is only 12x12. On paper, the N804 may actually have a higher sensitivity rating than the PM1 (I think it's 89dB vs. 84 on the PM1), but I'm guessing they're just as power-hungry as the little B&W monitors. I would own Marantz again, so not knocking the brand in any way, but for B&W N804 I'd go for more power.