If the OP still wants suggestions for an AVR with a great(open to interpretation) 2-channel preamp section,I would highly suggest an NAD T775HD, or the T785HD. The T775HD would probably be the better choice because with the Bryston amp driving the LCR, the more powerful T785HD's amp section might be redundant for just the surrounds. Therefore, the T775HD might be a great fit. He could go for the T765HD also if somewhat budget conscience.
Bill
Bill