If I was gigging as often, and for as long a time, as you are, Donny, I'd get myself a proper top end arranger and not muck about with entry level gear.
You love the Korg sound and are familiar with the OS, so why not get yourself a PA3X?
Didn't DonM have one for sale?
Maybe it's still available?
Ian
PS...if you are needing on-board speakers...the BK5's are pretty dismal.
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Yamaha Tyros4, Yamaha MS-60S Powered Monitors(2), Yamaha CS-01, Yamaha TQ-5, Yamaha PSR-S775.