You're probably not going to like the PA80, if you are a Yamaha man. The fill-ins and intros are limited. The Vocal Harmonizer sounds o.k., but only has one mode, with no options to select different settings.
It does sound good, but you will need quite a long time to become comfortable with the operating system.
If you can afford it, get a Tyros. If money is tight, get a 2000 or 2100.
DonM