Clavia Nord Stage 4 88 stage piano
For me, this instrument is simply the best you can get for the money. I'm sure there are better keyboards, organs, or synthesizers out there, but the NS4 is an excellent all-in-one package. The keyboard feels just right to me, the controls are intuitive, and the sound is amazing. Overall, I think it's the best combination for both professionals and amateurs.
If you're thinking about buying one - don't. Just try it first, and then you'll probably buy it anyway.
One unexpected side effect: since I got it at home, I've been practicing every day. That has never happened to me before.