John C, you asked for opinions on the difference between KN5000 and KN7000.
In the short time I have had my KN7000, I have noticed that the 5000 seemed to have a softer and more delicate feel generally. I put that down to the overall "power"(for lack of a better word)of the 7000. My friends think the KN7000 has better quality sounds, and I agree with them.
The KN7000 is very much oriented towards organ styles with many more than the KN5000 organ sounds. The KN5000 has more big band and jazz variations.
I think the KN7000 is a big advance overall on the previous models,and my next favourite is the KN5000. But back as far as the KN2000 all were great keyboards. IMHO
Just my 2 cents(tuppence) worth.
Ray

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Ray The Saint