"Can I get an arranger with Korg styles and Yamaha sounds? That would be my purchase!"
Sean,
Buy the Tyros, then download all the third-party Korg styles, put them on the hard drive, then attach the Yamaha voices to their associated OTS settings. Then you'll have exactly what you wished for.

Merry Christmas,

Gary
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!
K+E=W (Knowledge Plus Experience = Wisdom.)