I recently got a Yamaha CP4. I had a RD 700 NX and later a CP5, but I like the CP4 best. It is relatively light weight, incredible samples from 3 Yamaha grand pianos, good extra voices, easy to use and add a layer or split, and a real wood keyboard that feels terrific if you want to feel like you are playing on a real grand piano. And it costs less than the CP5 did- Yamaha did a nice job with this and it will be a keeper for me for a long time.

Hope that helps