I would go tubes with your b&ws, and probably would upgrade your speaks before plunking 2500 on an integrated.
The Plinius would probably work best, as the Sim is a brighter piece to go with B&Ws. I'm not a Musical Fidelity fan at all. The Classe integrateds go pretty well as to the MCs with B&W. And of course, some swear by Krell & B&W.
Aren't differing opinions great?