No harmonizer... (better than a bad one, IMO!)

Pianos collapse to mono MUCH better than PSR's, and sound amazing (with a little editing) in stereo. Rather than a mono amp, how about two smallish self powered PA speakers? Most of the stereo keyboard amp combos are a bit on the high dollar side...

And it has 76 keys...

Mind you, what pianist needs those?
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An arranger is just a tool. What matters is what you build with it..!