IF you have the room, probably the Harmon Kardon - UAV tested it as delivering 214 WPC @ 1000 Hz and 197 WPC @ 20 Hz, with ALL SEVEN channels driven into a four ohm load.
The NAD is limited to 131 WPC into a 4 ohm load, with all 7 channels driven.
That is excellent performance, the biggest downside is the ease of use. We will likely go with the NAD because my kids can use the front of the receiver easily - that is worth giving up the 2 dB difference is output, though in real world performance, it is likely not a 2 dB difference, as NAD usually has more short term headroom than its competitors.
For two GOOD, online sources, look at www.dmc-electronics.com for NAD and www.onecall.com for the H-K. Both will price match, and both are authorized dealers.
