Hi Cass,
I too have considered buying the PA500. I absolutely love my little Korg KMA but it sure is difficult to work with and get things setup for gigs. I don't think I would sell the KMA though because it is so easy transport. I find myself messing with it on a daily basis - often with it on my lap while watching TV. My Tyros 4 has not left the house in 2 months - I have been using the little KMA on gigs and my audiences just love it.

If you get the PA500 let us know how it works for you.

Deane