It seems we have returned to a sense of urgency about buying something new! Question is, do you REALLY need something? My guess would be, no…

As I said, why do you actually need another keyboard? My advice would be, if you are looking for inspiration, try to find it in your own playing, not equipment. That is a far more long-term solution, and a lot less expensive to boot!

But if you are determined to hook two arrangers together, I definitely would not waste my time hooking up two of the same brand. They will sound too similar. If you MUST get some thing, you were on the right track. Either a Korg or a Yamaha, something with a completely different sound and completely different styles…

But personally, I have no idea why you want anything more than just the BK9. It does everything! And it certainly sounds a damn sight better than a Prelude..!
_________________________
An arranger is just a tool. What matters is what you build with it..!