..about the tutorial features...

I have lookd at these features on several keyboards and they seem rather gimmicky to me. I suggest you consider some of the great 3d party sioftware available.

I am partial to the programs made by PG Music. They make Band-in-a-box, a great learning and practicing tool which every musician needs. They also have several piano "master class" programs which I highly recommend.

Other companies like Voyetra make piano-lesson programs that have been well-received. Don't know much about these others.

All of the keyboards mentioned in these posts have "MIDI-in" and "MIDI-out" connectors. This enables you to connect the keyboard to your computer's sound card. You will need a good sound card, and the most recommended of these is the Sound Blaster Live. Fifty bucks. Be prepared for a steep learning curve getting all the parts hooked up so the keyboard and computer work together. It's worth it.

JDW