Cass,

NO! Not the PA500 - you sing well - the 800 will float your boat (they are light years apart).

Look, they're all great boards and the audience doesn't give a crap. It comes down to your command of the keyboard, playing and singing skills and what YOU think sounds the best.

You've not tried the PA. It might be your ticket, might not - never know. I can tell you its a sleeper, full of amazingly musical character.