I agree with everyone.

Overall sound, I would rate the SD7, EA7,PSR970, PA4x.
Guitar (lead), EA7, SD7, PSR970, PA4x.
Balance, EA7, PSR970, SD7, PA4x.
Style, EA7, SD7, PA4x, PSR970.
Don I suspect you got the answer you expected.
My guess you were thinking about the SX900 (should be better than the PSR970)

Ketron is a bit overpriced compared to some others.

You already know the EA-7 you now have is the one.. and unsurpassed bang for the buck

And maybe Dave could use an extra PA4x