hi Squeak

it would be great for us like you say to have a PSR2100 with a DGX500 keyboard but its not going to happen. who would buy a Yamaha Clavinova if there was a PSR2100/DGX500 type of keyboard available ?
Yamaha is not there to serve your needs, its there to make money. thats why theres no hard disk in the PSR2100 they want you to buy a Tyros, its always a marketing plan.

Simon