I strongly suggest you look at the Cary Cinema 5. The Absolute Sound's multi-channel amp of the year award. Cary is known for tubes and they carry that warm, analog sound into the Cinema 5 which is a solid state amp. However, the warmth does not obscure the transparency or dynamics. Plus, B&W's love power and the Sig 805 will appreciate the 200W (Class AB)x 5. Actually, the true power rating is about 225 but Cary rates their amps conservatively. I use the Cinema 5 with B&W 803's and they make them sing!
Read the review on Cary's website as well as the comments on this site regarding this amp. Good luck!
AVGURU
Read the review on Cary's website as well as the comments on this site regarding this amp. Good luck!
AVGURU