And to hand in my two cents on the amateur/pro discussion: Is a pianist in a band more "pro" than the pianist who performs without a band but with the help of an arranger? I think the last one is at least smarter: he doesn't have to split the income in four or five

I consider a keyboard only to be "professional" if it's built to carry around a LOT. In and out suitcase, bumpy rides in cars, it has to withstand that. Where it comes to features, the top-ranges can all compete, no matter what the brand is.

Sound quality doesn't make the difference between "amateur" or "pro", IMHO. I mean, come on guys, even with the best PA system available, the sound is always "average" at best. Unless you play a concert hall, the conditions are hardly optimal.