Based on what I have, I would need to do a sound test. But from my speculations. The conion has super power and gets screaming loud. But the aiwa has a cleaner sound with productive bass. The M70 is another loud unit and distorts kinda soon. The aiwa disperses sound better through its 5 speaker system. The 777 is a cool sound. But the aiwa would kill it I think. Not sure about the not pictured 6400. But a side by side would be a better test. But in ending. Just buy 1. You'll be pleasantly surprised for what you get for the price.
Like Gordie I wonder how it does against the TDK 3 speaker. That was one of the best sounding new units I owned. The Altec Lansing was also a fantastic sounding unit.
Bad Boy Bill