Jedi, The PSR2000 contains 8 Registration buttons per Registration Bank, but . . .
you can also optionally set up the keyboard to load 'multiple' banks of Registrations as well. If you are seeing more than 8 registrations, I somehow think you've got your KB configured to load up another Registration Bank when you've reached the end of Reg Bank #1.

Jedi, as a longtime Technics keyboard devotee myself, I still would recommend you STAY with the PSR2000. Though the KN6500 is certainly a great keyboard, it is more than double the cost of the PSR2000. I'm confident that you will be able to easily conqueor the problems (confusion?) you're having with Yamaha's Reg Memory. PLEASE email me privately and I will spend some time with you (possibly on the telephone) to explain how to configure the PSR2000's registration feature to work for you. - Scott