Well.....You got out of the TOTL Yamaha Flagship T5 Arranger. Now you dumped the MOTL Yammie Flagship S970.

What was the T5 lacking or missing that made you downgrade? I'm sure I would love the T5, but really wanted 76 keys, so it made my PA 4X choice easier. $1400 difference is a large spread too.

You are definitely still in search of something either better or different. Since you moved away from the Yammies, I kinda feel that ship has sailed.

If you do go PA 4X, you will be getting a professional keyboard that both plays and looks the part....I wouldn't worry about learning the Korg OS, it is really intuitive.