Try the Casio stuff. The piano action is realistic for me- I'm no concert pianist, though. But Casio has such a bad name that the stuff, even when it's good, is pretty cheap. Here's what I bought:
Buy Casio CDP-100 88-Note Weighted Hammer Action Digital Piano online
I'm satisfied. My priorities were: MIDI control, good piano action, and some sort of speaker in case I want to practice on it for some reason. And it had to be cheap. Don't be fooled by the price here, you shouldn't have to pay that much.
The only thing I miss is the pitch wheels that are common to synths.