Tony, one more item: if you want a higher degree of off-axis capability you could investigate speakers specifically designed for this. One brand I've heard is Mirage, another Canadian company.
http://www.miragespeakers.com
I auditioned the Mirage Omnisat and Omni 60 several times. Moving around the room, the stereo image wasn't affected as much as traditional direct radiating speakers. However the tradeoff was an overall sound I didn't like -- diffuse, blurred, and spread out, even when on axis. In A/B testing with direct radiating speakers I greatly preferred them over the Mirages. Other people love the Mirage sound.
My M60/VP150/QS8/VTF-3 config are the best speakers I've heard at any price, so naturally I'm satisfied with them. If there's an abnormal off-axis problem, I haven't heard it. However 95% of my listening is 1 or 2 people, directly on axis, so I wouldn't be affected by it even if it existed.
