I'm happy with the Tyros4
as it is.
Plenty of awesome sounds and styles...I'm still exploring.
Where I have my fun (as I do with all of the Yamaha arrangers), is customizing the styles and OTS to let me put
my own stamp on the music I play.
I guess it's human nature to want more, but, I must say, so far I'm more than satisfied with the
basic Tyros4 without any frills.
The SA/SA2 sounds are mind-blowers, and the SA Organs are are close enough to a real B-3 (and I play a real B-3) to keep me very satisfied for some time to come.
I'm glad I spent my savings on a Tyros4...I'm broke...but, I'm happy.

Ian