They are selling Yamaha PSR 740's on eBay in bulk for $825 (plus necessary AC adapter). Music123.com sells the adapter and footpedal (Survival Kit) for $25. The PSR 740 has almost all the sounds and almost all of the styles of the PSR 9000. The PSR 9000 has many features that make it a superior keyboard, but you can get so much for $850, I think it's incredible. And the PSR 740 has a vocalizer. The Korg has the vocalizer as an option. The PSR 740 has more drum fills per style than the Korg.