Nothing new for me in an Arranger either. Your right, no one knows the differance except you. I would like to try out the Korg everyone is raving about but can't justify the price and I'm too lazy to learn a whole new system.
My BK9 can do the basics I need for live work just fine. I'm still putting in a lot of time fine tuning things but it does cover all the bases for me. Just did a block party under an outdoor Pavillion for about 200 + and had them on the floor for 3 hours straight. Never got to take a break. My JBL 515s were up to 3/4 power, the highest I ever ran them, and they covered the large area nicely. Could of used a sub but no one cared.
For myself I'd rather play just piano and am in the market for a new one. Anyone want a Casio Privia 350 in new condition ?