The Bryston 9B-ST has gotten excellent reviews, including a "Class A" rating by Stereophile. I own the Bryston 4B-ST and 5B-ST amps, and based on my experience with them, I can recommend the 9B-ST very highly. The other "killer" 5-channel amp, if money is no object, is the Krell 1500, which has 300 watts x 5, and retails for $8500. For more info on the Krell 1500, see the current issue of "Home Theater" magazine.