When it comes to keyboard amplification, especially acoustic pianos, I've found there are many schools of thought. None of them bad, just all different. No judgment here.
Well, in my bar band world, there aren't many FOH sound guys. And when I do get one, it's almost like I'm defending myself against their poor choices. Maybe in some alternate universe this would work for me, but that's not happening.
Second school of thought: the audience doesn't care that much, so bring whatever and that's good enough.
Yeah, well I have to listen to myself all night long, as do my bandmates, so I'm not bringing some mediocre amplification to any of my gigs. By the third set, you definitely sound like @ss.
Third school of thought: spend for something that sounds decent, but don't go nuts. Give yourself and your listeners a decent night. I have been in this school for a while. Bring decent amplification, but don't go nuts. Enter CPS SSv3, QSC K series, etc. All good, really.
Spend at least as much (or maybe more) than you've spent on your boards.
Feast on seductive ear candy all night. Wallow in the great sounds you're making. Make your bandmates happy. Impress the musos in the audience. Become an acoustic legend.
Works for me :)
Let me tell you why the fourth school has its advantages if you can afford it ..