I tend to agree the 801's are probably overkill for that room. As for HT vs. music, well, accuracy matters to both, I would think, and the greater bass of the 801's could help. That said, despite my past fondness for B&W, I would have to look hard at some of the other choices today like Salk and Philharmonic that probably offer much better value. Then spend tyhe money on room treatments and music/movies.
A friend has 803D's with the big center (the top one, don't recall the model number) and 805 surrounds. Fronts are driven by three Emotiva XPA-1's, rears by an XPA-2 (I think). Sounds pretty durn nice to me! When I listened, I am honestly not sure I would step from the 803's to the 802's; would have gone for the 801's for a significant difference. Fortunately, I have Magnepans and am sticking to them!
"After silence, that which best expresses the inexpressible, is music" - Aldous Huxley