The Shanling monoblocks are very good with the BH2's. The 50wpc is more then enough juice for my 12 by 17 living room. I can't really sit in the room with the volume above 50%. Lots of detail even at 20% of max volume. I have only owned the modded Shanling SP80's See the 6moons review.
http://www.6moons.com/audioreviews/shanling2/80.html
Chris Johnson's mod 1 from Parts Connexion really makes a big difference, per the review. The 50wpc stays the same, but the tubes are upgraded, as are a number of internal parts.
Thx,
Mario