Mikimiki,

What, exactly, constitutes a professional keyboard? There are folks on this and other forums that make a damned good living performing with Yamaha's PSR series and have done so for decades. Same is true for many, many other brands and models. The individuals that use them are professional in every aspect of the musical entertainment field. So, what defines a professional? http://en.wikipedia.org/wiki/Professional Obviously, not the price of the keyboard.

Cheers,

Gary