S900 or E-60...can't go wrong with either...each one has a few features the other doesn't, but both offer a great deal of bang for the buck.

E-60, with 76 keys, is better if you wish to play solo piano, the S900 offers a tremendous amount of third party support and, of course, the SA voices from the flagship Tyros2.

Most important...try BEFORE you buy.

Ian
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Yamaha Tyros4, Yamaha MS-60S Powered Monitors(2), Yamaha CS-01, Yamaha TQ-5, Yamaha PSR-S775.