B&W N805 amplification question

Hi all,
I recently purchased a set of nautilus 805 standmounts and i'm wondering what i should do for amplification. I have a rotel 1062 integrated, and i'm thinking of adding a rotel rb-1050 power amp; that way, the integrated could run the tweeters and the power could run the woofers. Would it be best to go this route or to get a more powerful power amp (say, the rb-1070) and use that exclusively to run the speakers?
Thanks

If you biamp, what do you intend to use for the crossover?