Pick up a Casio Previa and you will have a very inexpensive and light 88 note weighted keyboard controller that more than makes up for 61 keys. (or the P-85)

Yamaha does not need to make an Arranger with 76 keys, They will sell everyone they make with 61 keys becasue of the SUPPORT available for their line. We don;t sell a whole lot of Tyros but we sell a ton of S900 and package them with the P-85 for those who don't want to pay for the Clavinovas and those who play out professionally.

In the Home Studio we use a Roland RD700 for the controller but that's a beast to carry around and the Yamahas and Korgs have just as good if not better Piano sounds depending on what you like..