Try the 4B ST. The ST would give you a much better window into the mid and high when compared to the NRB. If you want, you can bi-amp with a SF 40 for mid/high, this would be a good combination. However, to bi-amp you need to have the professional version of 4B to fine-adjust the balance. Good luck.
Amp for B&W 802 SIII
Looking for Amp recommendations for my B&W 802 SIII. System includes a Meridian 508-20 CD and an Audio Research LS 25 MKII preamp. Currently powered by a Bryston 4b nrb.(enough power, but looking for more midrange lucidity. Any expereience with ARC VT100 MKII or Krell FPB200/300?