To answer the QSC question, I couldn't warm up to the QSC sound.. I found them harsh, not unlike other high power speakers (Podium Pro etc).. They are loud, not the misleading numbers  companies are posting though..
Don, the problem with two arrays in stereo... as I mentioned many times... voice cancellation..
I think that 90 degree is more than enough dispersment..180-360 degree is way overkill.. and asking for problems.
I still use old Roland Cube 100's that have the sound and capability that I need/want.. and with added mixer (Edirol) it runs with the output of the QSC and others.. As for numbers Roland rates the Cubes at 100 watts... Just compare the Roland 100 watts to the 2,000 watt QSC.... What a joke!!!
One of the most pleasing speakers, with a warm even sound that fills a room is the Marantz voice rover..
Where Gary is using the Bose Compact, I find I can get the same results with the Marantz..(it has a 10 inch long throw woofer, and a wide horn)..