Zuki.... one thing you'll definitely be giving up is that wonderful key-bed the VA76 has (and the G70 and G1000). You won't be gaining any more polyphony. I would think you really need to get to play one and hear the sound quality for yourself, preferably side by side with your VA76, before you make any decision....

Just curious as to why you think this is a move up?
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An arranger is just a tool. What matters is what you build with it..!