The new Yamaha PSR292 (not PSR290) and DGX202 are both the same keyboards but one has 76 keys and the other has 61 and the 76 has a pitch bend wheel. No disk drives in either one.
The DGX300 and DGX500 both have lightly weighted piano keys compared to the others with synth light keys. I like the 300 and 500 alot. If you want a very good piano sound and all the other styles and voices and don't want to spend too much, these are very good choices. Even in a year or so, these are so reasonably priced that you shouldn't loose much when you go to sell them. They both will record 6 tracks and both will play back 16 track midifiles. You can't record your own rhythms but you can load a custom one to play from disk.
Other choices like the PSR550 are very good, but these keyboards are a little more difficult to operate especially to record songs compared to the others.
George Kaye
Kaye's Music Scene
Reseda, California