Magic Roy,
The 9000 pro is still a current model and the PSR9000 has been discontinued (Tyros is the replacement). The keyboard on the 9000 pro feels so much better. It is using the Yamaha Motif 7's keyboard which yamaha calls "synth weighted" and is much more pro feeling than the PSR9000. If you like great piano's you can install the piano expansion board besides the great piano inside the 9000pro. The other major thing is the difference in weight of the two products. The 61 key model PSR900 weighs 22.5kg and the 76 key 9000 pro weighs 20.5 kg. If you need seakers, the Yamaha YSTMS50's at $99.00 and 80 watts of power make a great small pa system compared to the built in 56 watt system with no sub woofer as the YST system has. the 9000 pro has 342 original voices compared to the PSR900's 331 original voices which include new sampled pianos, flutes, and other "sweet voices" not all found in the PSR9000.
George Kaye
Kaye's Music Scene
Reseda, California
818-881-5566