1 61 note arranger + 1 76 note second keyboard = more than 1 76 'heavy' 76 arranger (especially if you use cases)

More to move, more to set up, more to figure out how to get the two to work seamlessly...

It would be interesting to see how many 61 Yamaha users out there WOULD buy a 76 if they made one.... Are YOU one? 'Fess up...

A 76 PSR using the NP-30 action would weigh maybe 8-10 lb. more than an S900. Still PLENTY light enough for the less 'active' players, IMO