The Casio has 256 notes of polyphony, and it is very reasonably priced, and doesn't need a controller as it already has a highly regarded 88 note weighted action.

I really like what I am hearing both in the demos and from those using it.

It can also act as an extremely powerful controller if need be. It has pitch/mod Wheels that I find best for my way of playing.

Plus, there is great followup support.

It gets my vote for sure.

Ian