Mike,
One great thing about the PA80 is the ability to rewrite all the factory styles and replace them with stuff YOU use! If you're not a "polka" guy, for instance ... you can ditch them all, and put in the styles you DO like !
The basic styles are awesome .... it's the fills that are a little nerve racking, but coming from an RA50 .... you're going to think you died and went to heaven !
You can also midi the RA into the Korg for sounds .... it'll open up many style possibilities for you.