Back on topic... I'd say, first of all decide what REAL piano sound you like best, then go look for a digital that approximates it.
Pianos are as varied as guitars, no two sound alike, no two feel alike. I feel far too many people go buy a digital piano before they have familiarized themselves (or reacquainted themselves) with the real thing. Spend an afternoon on the real thing, the best you can lay your hands on, THEN go play the digitals... You'd be amazed how different the two can be.
Me, I like to hear a nice warm sound in the ppp to mf range, something that, IMO, few digitals really capture. EQ doesn't cut it, it has to be in the samples.
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An arranger is just a tool. What matters is what you build with it..!