Scott,
I heard this being said so often. When I played the Psr3000 along side of a S900 many said there was very little difference -- I heard a big difference, the S900 was alive compared to.

S910 compared to a Tyros 2 may have some of the same features but the over all sound has to be different. Because they differ in price I would find it hard to think that Yamaha made them equal in sound quality.

But --- knowing you Scott there will be no true satisfaction until you have the top-of-the-line Tyros 3. I have one and I think it's great, it covers all my needs and more.
John C.