I have a few NAD, Rotel, and Adcom amps. I like my Emotiva amp more overall, though there are some presentation differences between the brands that lend themselves to certain music more than others.

I don't know much about B&K because I haven't heard much of their gear. Parasound's stuff the last few years has been pretty good though. If price isn't an object I'd recommend Parasound of the bunch you list. I love my Rotel amp, and on some music it's a bit more, well, intimate sounding. Hard to explain. It's not as versatile though.

If money is a concern you can get a lot of value out of Emotiva's amps and maybe make bigger gains investing elsewhere in your system. I would be very wary of anyone who says brand X is better than brand y in every system. Especially at a fraction of the price. Emotiva's big feature is value, a lot of bang for the buck. But they're not making Bryston or Krell gear by any means.