An option for a module would be the Ketron XD3. The sounds and styles are great. This module would not be a downgrade from the PA80 but might be considered an upgrade by many on this forum. The XD3 has mostly the sounds and styles from the flagship SD1plus keyboard. In my store I sell both the Korg and the Ketron products and the choice of one over the other is strictly a personal choice decesion.
The i5m module would not even be in the same league as the XD3 module. The XD3 module would cost quite a bit more then an old, used i5m, but worth the difference in quality of performance.
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George Kaye
Kaye's Music Scene
Reseda, California
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George Kaye
Kaye's Music Scene (Closed after 51 years)
West Hills, California
(Retired 2021)