I will simply give my experience, I don't know if it is possible in your budget; I am using a Classe CA-2200 amp with my Signature 805's, also in a log home and find this to be a great combination/match. (You can see the rest of my system by clicking the link.) If you are not aware, Classe is owned by B&W, as is Rotel, something to consider.
What amp to drive my B&W N Sig 805's?
My room is large 26x20 with a 30 foot peak. The front large wall is all glass and the rest is log. My plan is to run the sig 805's for stereo sound in this room and also power a second set of bookshelfs in the kitchen off the same amp. What amp should I choose? I have looked at some Mark Levinson and Aragons. I see the posted comments about needing power to drive B&W Nautilus speakers. I like clean, brilliant, not necessarily warm sound. Integrated amp (to save $) or combo? Price range is up to $3g.