I want to give you real good advice if you are in doubt which keyboard is best for you. One word "GUITAR CENTER", large national chain that allows 30 days money back. They should have all those keyboards you mentioned and they will do price match also.

You will not know whether a keyboard is right for you until you actually try one for a week or two. There's just too many things that can displease you. I changed 5 times before settling my final choice and then finally someone offered me a used one for much cheaper and returned the keyboard to GC. I felt bad for GC after trying out their KB but if it were not for the 30 days policy, I would have ended up less happy.

For example: what if I can't split the keyboard ? what if the piano sounds bad ? what if the registration does not work the way I like it ? etc, etc,etc,