I recently had the opportunity to play the VA76. I was not impressed. The Variphase is a nice toy but I can not see a use for it when playing live, and its quality is questionable. As a former G1000 owner the VA76 is an extention of that technology with a few more bells ad whistles. If you were thrilled with the G1000 then you will like the VA76.
If I had to rank the present crop of arranger KB's I have played it would be:
#1 Ketron SD1..fun to play/Great Styles & Sounds (This is my current KB)
#2 Yamaha 9000 Pro..Same as above/Styles not as good but a terrific KB
#3 VA76..Nothing to get excited about.
#4 PA80..More complex Styles/Great synth sounds/Keyboard feel very "inexpensive"
This is one man's oppinion!!! I have played them all (owned the PA80).