Hi Zuki,
I had a T4 and a S970.
Now I have a Genos and S970 for smaller gigs.
Personally I think it is easier to stay with the same brand.
In your case the 1000.
Same OS, most same styles and voices, VH etc.
Much easier to built play lists and go back and forth ...
I thought about the 1000 a few times, but it would be a steep learning curve for me, starting from scratch etc.
The S970 is perfect for what it does for smaller gigs.
My main board is the Genos of course.
In your case the PA4X.
Good luck whatever you decide.
You can't go wrong with what's out there today ...
Eric