I had good success with Musical Fidelity's original A3cr pre and power combo, though it was driving the much cheaper B&W 602 bookshelves. The Musical Fidelity top-end is smooth and grain-free, which makes it a good match with the metal dome tweeters of B&W. The 602s can sound harsh on other amplification. Bi-amp with two if you really want to make those 805s sing. You will be surprised how much bass they can output given enough clean power. Properly driven, even small B&Ws have shattering dynamics.
PS Audio's new HCA-2 could also work well. Though rated rougly the same power, it seems to have higher peak current for driving reticent loudspeakers such as Magnepan.
PS Audio's new HCA-2 could also work well. Though rated rougly the same power, it seems to have higher peak current for driving reticent loudspeakers such as Magnepan.