Don't know if you knew this or not, but some of the Outlaws are former NAD-ers.

And now, my personal opinion only, I have followed NAD over the years. Great sounding gear, not a lot of features or frills (sound family so far?), but... In terms of recent technology, DD EX, DTS-ES, DPL II, they are behind.
I personally think at this point, Outlaw is the better buy.
B&K Ref 30? I also looked at this one. You'll pay close to $2g for it (although I haven't checked lately), but the reviews that I've seen, say it isn't as "musical" as the latest crop of pre/pros. (Anthem, Rotel, Outlaw, etc.) Also, important for me, don't know for you: The B&K does *not* have DSP modes to "expand" 2.0 through 5.1 sources to 6.1 or 7.1 speaker system.
But in general, I personally do like B&K gear. They make great amps. I would wait and see what the successor to the Ref 30 is.