Donny knows very well what the dream kit is, once and for all, because Bill Abacus has told him, Tyros 4 on top with a KKW (Korg Kronos Workstation) below, bill has studied this very carefully, coming from a Wersi man it must be good advice.
Good Luck with your choice Donny, we all wait with excitement.
Tony

Now if you want to wait for the T5 they will both be in Black
Tony, after hearing the Kronos YouTube demos you shared with me, and having had experience with the original Korg Karma some time ago in the studio, I'd say it is the perfect companion to a Tyros4.
Dream kit for sure.
And
you have the advanced playing skills to make great use of such a combination...even though you mainly play at home.
I can see Donny's point in that an arranger would do the gig job on it's own, and probably simplify setup/teardown, but, having
both the Kronos and Tyros4 on a gig would be the bomb.
The world would be your oyster, even though it's going to cost you a few clams.

I don't envy people, but I'm coming close to it with your
possible purchase of the Kronos to use as a companion to your Tyros4.
After all the problems, issues, and frustrations, you had with the Ketron Audya, and in spite of how great it sounds, I know you'll be glad to see those end cheeks go out the door.
Korg's reputation is far better, and you can rest assured you will get great support, especially on Korg Forums, and also here on SZ.
Great choice, Tony,
Ian