About a year ago, I went to an equipment shop just to kill some time, without any intention or need to buy anything whatsoever. I played the Roland RD2000 and HAD TO buy it straight away just for its superb action. Quite an expensive time killer that was, but I've never looked back. Since then, I've played keys more than ever, ever before. Accordingly, my rather limited piano playing skills have increased a lot.
I'm by no means saying that the RD2000 is the best option out there, or that it's the right option for you. What I'm saying from own experience is that it's extremly important to have an action and feel that makes you want to play as much as you can and that inspires you! I've been enjoying playing the piano so much since the purchase, that I'm really considering to buy a "real thing" baby grand to have at home. And I've never been a piano man really, I'm a guitarist.