Help deciding which amp to use

1-nice deal
2-you really want matching sound/amps for all 3 front channels-you have to use either the nak or b&k.
3-the nak is no slacker
4-which models of rotel, b&k & parasound? The Rotel may be a little 20 watt job that isn't worth more than $100? Same with the others?

I agree with Elevick that having the LF/C/RF match closely is important for home theater, and this includes the tonality of the speakers. As far as amps are concerned, their tonal qualities are important, but in my experience the amplifier gains are also a factor that must be considered. Even if maximum power ratings are different, it is gain that will make an audible difference. The front three speakers must be an integrated, seamless tapistry of sound that should not draw attention to any one speaker (e.g. as sound travels L to R across the front, it should not change as it moves from L to C to R). If everything is not closely matched you will hear the speaker transitions. That said, I would use the three channel B&K for LF/C/RF, and then choose between the other two based upon gain, maximum power and tonal qualities for the LR and RR (compared to the B&K). Just my opinion, based upon my experiences.

Elevick brings up anoher point that I did not address. What are the power ratings of these amps? My comments assumed sufficient power for a home theater application. However, if the maximum power available is not at least 100W per channel, then I will reconsider my recommendations. Also, keep in mind that going with separates will require decent cables to maximize the quality of sound.