64 poly is the standard for modern arrangers except the top-of-the-line ones like T2, G70 and E80 etc., so it should be sufficient. I don't recall hearing any dropouts on my old G1000, and that was 64 voice (tops for it's day).

And you layer ANY keyboard and polyphony drops, but, once again, I never noticed it layering my G1000. Shouldn't be a problem.

And you might want to take a look at the specs for the forthcoming Korg PA800 - a bit more expensive, but the sampler looks like a winner and it has TC Helicon voice processing.........