Ted:
The sounds are greatly improved such as the strings. They now sound pure and sweet compared to the 6500.
The new organ sounds alone are worth the change from the 6500. I am new to the 7000, having owned it only a month but it is a joy to play, each day I marvel at at the sounds and rhythms.
I have not explored the SD as yet but I know that in the future it will be very useful.
I have a couple of friends who are organist's and keyboard players. They heard the 7000 and are waiting for their own 7000's to be delivered.
This is my opinion but playing it believing.
Hope this will make you feel good about buying a KN7000. Good luck and good playing.
Sincerely, Lloyd